Recent Applications of C–H Functionalization in Complex Natural Product Synthesis
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Manhattan, KS
Acknowledgements General Chair Daniel A. Higgins Program Chair J. Vincent Ortiz Symposia Chairs Crystal Engineering – Supramolecular Chemistry Christer Aakeröy Drug Discovery and Bioorganic Chemistry Duy H. Hua Environmental Chemistry Larry E. Erickson Methods of Electronic Structure Theory J. Vincent Ortiz Nanostructured Materials and Air Quality Kenneth J. Klabunde Sol-Gel Chemistry Maryanne M. Collinson Undergraduate Research Stefan Kraft Treasurer Yasmin Patell Exposition Chair Earline Dikeman Undergraduate Program Janie Salmon Audio/Video Resources James R. Hodgson Program Book Ruth Hathaway Printing/Publicity Ellen Stauffer KSU Div. of Continuing Education Website KSU Div. of Continuing Education Program Book Art Jessa Talamentez KSU Div. of Continuing Education Midwest Award Leah O’Brien ACS Regional Meeting Planner John Michael Sophos Welcome to the 39th Midwest Regional Meeting of the American Chemical Society October 20-22, 2004 Manhattan Holiday Inn Holidome Manhattan, KS Hosted by the Kansas State University Section Local Sections of the Midwest Region Of the American Chemical Society Ames Iowa Kansas City Kansas State University Mark Twain Mo-Kan-Ok Nebraska Omaha Ozark Sioux Valley South Central Missouri Southern Illinois St. Louis University of Kansas University of Missouri University of Arkansas Wichita MWRM 2004 39th Midwest Regional Meeting October 20-22, 2004 Table of Contents Acknowledgements inside front cover Welcome 1 Local Sections of the Midwest Region 2 Table of Contents 3 Special Greeting Brad Everett, Mayor, -
Organic Synthesis: Handout 1
Prof Tim Donohoe: Strategies and Taccs in Organic Synthesis: Handout 1 Organic Synthesis III 8 x 1hr Lectures: Michaelmas Term Weeks 5-8 2016 Mon at 10am; Wed at 9am Dyson Perrins lecture theatre Copies of this handout will be available at hEp://donohoe.chem.ox.ac.uk/page16/index.html 1/33 Prof Tim Donohoe: Strategies and Taccs in Organic Synthesis: Handout 1 Organic Synthesis III Synopsis 1) Introduc5on to synthesis: (i) Why do we want to synthesise molecules- what sort of molecules do we need to make? (ii) What aspects of selecvity do we need to accomplish a good synthesis (chemo-, regio- and stereoselecvity)? (iii) Protecng group chemistry is central to any syntheAc effort (examples and principles) (iv) What is the perfect synthesis (performed in industry versus academia)? 2) The chiral pool: where does absolute stereochemistry come from? 3) Retrosynthesis- learning to think backwards (revision from first and second year). Importance of making C-C bonds and controlling oxidaAon state. Umpolung 4) Some problems to think about 5) Examples of retrosynthesis/synthesis in ac5on. 6) Ten handy hints for retrosynthesis 7) Soluons to the problems Recommended books: General: Organic Chemistry (Warren et al) Organic Synthesis: The DisconnecRon Approach (S. Warren) Classics in Total Synthesis Volumes I and II (K. C. Nicolaou) The Logic of Chemical Synthesis (E. J. Corey) 2/33 View Article Online / Journal Homepage / Table of Contents for this issue 619461 Strychniqae and BYucine. Pavt XLII. 903 Prof Tim Donohoe: Strategies and Taccs in Organic Synthesis: Handout 1 (i) Why do we want to synthesise complex molecules? Isolated from the Pacific Yew in 1962 Prescribed for prostate, breast and ovarian cancer Unique mode of acRon 1x 100 year old tree = 300 mg Taxol Isolated in 1818- poisonous Stuctural elucidaon took R. -
51Th International Mendeleev Olympiad, 2017 Astana 1St Theoretical Tour Problems
51th International Mendeleev Olympiad, 2017 Astana 1st theoretical tour Problems Problem 1 “I’ll be back” Terminator T-800 Paying tribute to my constant co-author Plastic pollution is defined as accumulation of plastic products in the environment producing a negative impact on animal and human habitats. This problem is among the most vital challenges facing humanity nowadays. Surprisingly, sometimes nature itself offers assistance, such as bioremediation. Thus, Japanese researchers have recently discovered that the bacterium Ideonella sakaiensis can use polyethylene terephthalate (PET), a polymer with an extremely high resistance towards biodegradation, as the major source of carbon and energy. O O O O n PET biodegradation involves two enzymatic steps catalyzed by hydrolases and leading to three low molecular weight (М<600 g/mole) aromatic products A, B, and C with the number of types of hydrogens of 2, 4, and 6, respectively. After penetration inside Ideonella sakaiensis cells, C is metabolized into А, which turns out to be the only source of carbon for the bacterium. 1. Show the chemical bonds (use arrows) in the PET formula that are cleaved in the process of its hydrolase-catalyzed biodegradation. 2. Draw all possible structures of A, B, and C, which are in agreement with the given data. A undergoes a three-step enzyme catalyzed metabolic transformation (all chemical equations): O 2 CO2 O2 O A A1 A2 X OH X + + + + A3 NADPH + H NADP NADP NADPH + H X is a functional group in A3, NADP+ and NADPH are oxidized and reduced co-enzyme forms, respectively. 3. Deduce the structural formula of A3 if its molar fractions of oxygen and hydrogen are equal and lower than that of carbon. -
Enantioselective Total Synthesis of (-)-Deoxoapodine
Enantioselective total synthesis of (-)-deoxoapodine The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Citation Kang, Taek, et al., "Enantioselective total synthesis of (-)- deoxoapodine." Angewandte Chemie International Edition 56, 44 (Sept. 2017): p. 13857-60 doi 10.1002/anie.201708088 ©2017 Author(s) As Published 10.1002/anie.201708088 Publisher Wiley Version Author's final manuscript Citable link https://hdl.handle.net/1721.1/125957 Terms of Use Creative Commons Attribution-Noncommercial-Share Alike Detailed Terms http://creativecommons.org/licenses/by-nc-sa/4.0/ HHS Public Access Author manuscript Author ManuscriptAuthor Manuscript Author Angew Manuscript Author Chem Int Ed Engl Manuscript Author . Author manuscript; available in PMC 2018 October 23. Published in final edited form as: Angew Chem Int Ed Engl. 2017 October 23; 56(44): 13857–13860. doi:10.1002/anie.201708088. Enantioselective Total Synthesis of (−)-Deoxoapodine Dr. Taek Kang§,a, Dr. Kolby L. White§,a, Tyler J. Mannb, Prof. Dr. Amir H. Hoveydab, and Prof. Dr. Mohammad Movassaghia aDepartment of Chemistry, Massachusetts Institute of Technology Cambridge, MA 02139 (USA) bDepartment of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467 (USA) Abstract The first enantioselective total synthesis of (−)-deoxoapodine is described. Our synthesis of this hexacyclic aspidosperma alkaloid includes an efficient molybdenum-catalyzed enantioselective ring-closing metathesis reaction for desymmetrization of an advanced intermediate that introduces the C5-quaternary stereocenter. After C21-oxygenation, the pentacyclic core was accessed via an electrophilic C19-amide activation and transannular spirocyclization. A biogenetically inspired dehydrative C6-etherification reaction proved highly effective to secure the F-ring and the fourth contiguous stereocenter of (−)-deoxoapodine with complete stereochemical control. -
Functionalization of Heterocycles: a Metal Catalyzed Approach Via
FUNCTIONALIZATION OF HETEROCYCLES: A METAL CATALYZED APPROACH VIA ALLYLATION AND C-H ACTIVATION A Dissertation Submitted to the Graduate Faculty of the North Dakota State University of Agriculture and Applied Science By Sandeepreddy Vemula In Partial Fulfillment of the Requirements for the Degree of DOCTOR OF PHILOSOPHY Major Department: Chemistry and Biochemistry October 2018 Fargo, North Dakota North Dakota State University Graduate School Title FUNCTIONALIZATION OF HETEROCYCLES: A METAL CATALYZED APPROACH VIA ALLYLATION AND C-H ACTIVATION By Sandeepreddy Vemula The Supervisory Committee certifies that this disquisition complies with North Dakota State University’s regulations and meets the accepted standards for the degree of DOCTOR OF PHILOSOPHY SUPERVISORY COMMITTEE: Prof. Gregory R. Cook Chair Prof. Mukund P. Sibi Prof. Pinjing Zhao Prof. Dean Webster Approved: November 16, 2018 Prof. Gregory R. Cook Date Department Chair ABSTRACT The central core of many biologically active natural products and pharmaceuticals contain N-heterocycles, the installation of simple/complex functional groups using C-H/N-H functionalization methodologies has the potential to dramatically increase the efficiency of synthesis with respect to resources, time and overall steps to key intermediate/products. Transition metal-catalyzed functionalization of N-heterocycles proved as a powerful tool for the construction of C-C and C-heteroatom bonds. The work in this dissertation describes the development of palladium catalyzed allylation, and the transition metal catalyzed C-H activation for selective functionalization of electron deficient N-heterocycles. Chapter 1 A thorough study highlighting the important developments made in transition metal catalyzed approaches for C-C and C-X bond forming reactions is discussed with a focus on allylation, directed indole C-2 substitution and vinylic C-H activation. -
The Total Synthesis of Securinine and Other Methodology Studies
University of Windsor Scholarship at UWindsor Electronic Theses and Dissertations Theses, Dissertations, and Major Papers 2010 The total synthesis of securinine and other methodology studies Bhartesh Dhudshia University of Windsor Follow this and additional works at: https://scholar.uwindsor.ca/etd Recommended Citation Dhudshia, Bhartesh, "The total synthesis of securinine and other methodology studies" (2010). Electronic Theses and Dissertations. 8275. https://scholar.uwindsor.ca/etd/8275 This online database contains the full-text of PhD dissertations and Masters’ theses of University of Windsor students from 1954 forward. These documents are made available for personal study and research purposes only, in accordance with the Canadian Copyright Act and the Creative Commons license—CC BY-NC-ND (Attribution, Non-Commercial, No Derivative Works). Under this license, works must always be attributed to the copyright holder (original author), cannot be used for any commercial purposes, and may not be altered. Any other use would require the permission of the copyright holder. Students may inquire about withdrawing their dissertation and/or thesis from this database. For additional inquiries, please contact the repository administrator via email ([email protected]) or by telephone at 519-253-3000ext. 3208. The Total Synthesis of Securinine and Other Methodology Studies by Bhartesh Dhudshia A Dissertation Submitted to the Faculty of Graduate Studies through the Department of Chemistry and Biochemistry in Partial Fulfillment of the Requirements -
Polyacetylene: Myth and Reality
materials Review Polyacetylene: Myth and Reality Bruce S. Hudson Department of Chemistry, Syracuse University, Syracuse, NY 13244-4100, USA; [email protected]; Tel.: +1-315-443-5805 Received: 31 December 2017; Accepted: 31 January 2018; Published: 6 February 2018 Abstract: Polyacetylene, the simplest and oldest of potentially conducting polymers, has never been made in a form that permits rigorous determination of its structure. Trans polyacetylene in its fully extended form will have a potential energy surface with two equivalent minima. It has been assumed that this results in bond length alternation. It is, rather, very likely that the zero-point energy is above the Peierls barrier. The experimental studies that purport to show bond alternation are reviewed and shown to be compromised by serious experimental inconsistencies or by the presence, for which there is considerable evidence, of finite chain polyenes. In this view, addition of dopants results in conductivity by facilitation of charge transport between finite polyenes. The double minimum potential that necessarily occurs for polyacetylene, if viewed as the result of elongation of finite 1 1 chains, originates from admixture of the 1 Ag ground electronic state with the 2 Ag excited electronic singlet state. This excitation is diradical (two electron) in character. The polyacetylene limit is an 1 equal admixture of these two Ag states making theory intractable for long chains. A method is outlined for preparation of high molecular weight polyacetylene with fully extended chains that are prevented from reacting with neighboring chains. Keywords: polyacetylene; double-minimum potential; Peierls barrier; zero-point level; cross-linking 1. Introduction/Background History Polyacetylene is selected for review because of its relative simplicity; the small periodic repeat permits polyacetylene to be treated by sophisticated computational methods. -
Recent Advances in Total Synthesis Via Metathesis Reactions
SYNTHESIS0039-78811437-210X © Georg Thieme Verlag Stuttgart · New York 2018, 50, 3749–3786 review 3749 en Syn thesis I. Cheng-Sánchez, F. Sarabia Review Recent Advances in Total Synthesis via Metathesis Reactions Iván Cheng-Sánchez Francisco Sarabia* Department of Organic Chemistry, Faculty of Sciences, University of Málaga, Campus de Teatinos s/n. 29071- Málaga, Spain [email protected] Received: 16.04.2018 ly explained by the emergence, design, and development of Accepted after revision: 30.05.2018 powerful catalysts that are capable of promoting striking Published online: 18.07.2018 DOI: 10.1055/s-0037-1610206; Art ID: ss-2018-z0262-r transformations in highly efficient and selective fashions. In fact, the ability of many of them to forge C–C bonds be- Abstract The metathesis reactions, in their various versions, have be- tween or within highly functionalized and sensitive com- come a powerful and extremely valuable tool for the formation of car- pounds has allowed for the preparation of complex frame- bon–carbon bonds in organic synthesis. The plethora of available cata- lysts to perform these reactions, combined with the various works, whose access were previously hampered by the lim- transformations that can be accomplished, have positioned the me- itations of conventional synthetic methods. Among the tathesis processes as one of the most important reactions of this centu- myriad of recent catalysts, those developed and designed to ry. In this review, we highlight the most relevant synthetic contributions promote metathesis reactions have had a profound impact published between 2012 and early 2018 in the field of total synthesis, reflecting the state of the art of this chemistry and demonstrating the and created a real revolution in the field of total synthesis, significant synthetic potential of these methodologies. -
Synthesis of Oxymethylene Ethers
Synthesis of Oxymethylene Ethers Dissertation Zur Erlangung des akademischen Grades Doktor der Naturwissenschaften (Dr. rer. nat.) vorgelegt an der Fakultät für Chemie und Biochemie der Ruhr-Universität Bochum von Anna Grünert Bochum Oktober 2019 Die vorliegende Arbeit wurde in der Zeit von Februar 2016 bis Oktober 2019 in der Abteilung für Heterogene Katalyse am Max-Planck-Institut für Kohlenforschung in Mülheim an der Ruhr unter der Leitung von Prof. Dr. Ferdi Schüth angefertigt. Referent: Prof. Dr. Ferdi Schüth Korreferent: Prof. Dr. Martin Muhler I I Acknowledgements Firstly, I would like to thank my team of supervisors, Prof. Dr. Ferdi Schüth and Dr. Wolfgang Schmidt, and my co-examiner Prof. Dr. Martin Muhler. Ferdi, I would like to thank you for your trust that is the basis of the exceptional freedom of work, which you grant not only to me, but to all of your PhD students. You gave me the resources, time and liberty to develop my PhD project in my own way, to make mistakes, to solve challenging problems and to grow as a person. I am grateful for your appreciation of a cooperative and welcoming atmosphere in the group, which is most apparent in your yearly invitation to the group trip to Oberwesel. Wolfgang, I owe my thanks to you for your advice on many topics including material synthesis, catalyst characterisation and manuscript writing. I very much appreciate your welcoming and relaxed attitude. I am also thankful that to you both that you enjoy sharing your knowledge and experience with me and my colleagues in catalysis seminars and other technical seminars and in the focused project meetings. -
Total Synthesis of ( )-Hennoxazole a Vol
ORGANIC LETTERS − 2007 Total Synthesis of ( )-Hennoxazole A Vol. 9, No. 6 1153-1155 Thomas E. Smith,* Wen-Hsin Kuo, Victoria D. Bock, Jennifer L. Roizen, Emily P. Balskus, and Ashleigh B. Theberge Department of Chemistry, Williams College, Williamstown, Massachusetts 01267 [email protected] Received January 31, 2007 ABSTRACT An enantioselective, convergent, total synthesis of the antiviral marine natural product (−)-hennoxazole A has been completed in 17 steps, longest linear sequence, from serine methyl ester and in 9 steps from an achiral bisoxazole intermediate. Elaboration of a thiazolidinethione allowed for rapid assembly of the pyran-based ring system. Key late-stage coupling was effected by deprotonation of the bisoxazole methyl group, followed by alkylation with an allylic bromide side chain segment. Marine natural products have become increasingly important Williams,5 and Shioiri6 laboratories.7 In this communication, as lead compounds for the development of new drugs as a we report the shortest asymmetric total synthesis of hen- consequence of their intriguing structural diversity and noxazole A to date. biological activity.1 Hennoxazole A (1), first isolated by The development of relatively mild conditions for the Scheuer from the marine sponge Polyfibrospongia, displays preparation of oxazoles has made the late-stage assembly of antiviral activity against herpes simplex type 1, as well as these ring systems a common, albeit not always efficient, peripheral analgesic behavior.2 The two contiguous 2,4- strategy in the synthesis -
Noah Burns CV 2019
Noah Z. Burns, Ph.D. Curriculum Vitae Stanford University office: 335 Lokey Department of Chemistry phone: (650) 723-2961 333 Campus Drive [email protected] Stanford, CA 94305 burnschemistry.com APPOINTMENT Associate Professor 2019 Stanford University, Stanford CA Assistant Professor 2012–2019 Stanford University, Stanford CA EDUCATION AND TRAINING Postdoctoral Fellow (NIH) 2009–2012 Harvard University, Cambridge MA Advisor: Eric N. Jacobsen Doctor of Philosophy 2004–2009 The Scripps Research Institute, La Jolla CA Advisor: Phil S. Baran Thesis: Total Syntheses of Haouamine A Bachelor of Arts, Chemistry 2000–2004 Columbia University, New York NY Advisor: James L. Leighton AWARDS AND HONORS 2019 Eli Lilly Young Investigator Award 2019: NSF CAREER Award 2018: Kavli Fellow 2017: Dean's Award for First Years of Teaching at Stanford 2017: Amgen Young Investigator Award 2013–present: Stanford Terman Fellow 2012: Thieme Chemistry Journal Award 2009–2012: NIH NRSA Postdoctoral Fellow 2006–2008: ARCS Foundation Scholarship 2006: Roche Excellence in Chemistry Award 2005–2006: TSRI Dean’s Fellow 2004: Graduated Summa Cum Laude, Columbia University 2004: Phi Beta Kappa 2003: Barry M. Goldwater Scholarship 2002: NSF Summer Undergraduate Research Fellowship PEER-REVIEWED PUBLICATIONS INDEPENDENT CAREER Smith, M. W.; Falk, I. D.; Ikemoto, H.; Burns, N. Z. “A Convenient C–H Functionalization Platform for Pyrroloiminoquinone Alkaloid Synthesis,” Tetrahedron 2019, 75, 3366–3370. [Invited contribution in honor of Professor Ryan Shenvi, recipient of the 2019 Tetrahedron Young Investigator Award.] Landry, M. L.; McKenna, G. M.; Burns, N. Z. “Enantioselective Synthesis of Azamerone,” J. Am. Chem. Soc. 2019, 141, 2867–2871. Kearney, S. E. et al. “Canvass: A Crowd-Sourced, Natural-Product Screening Library for Exploring Biological Space,” ACS Central Science 2018, 4, 1727–1741. -
Chemical Innovation Technologies to Make Processes and Products More Sustainable
United States Government Accountability Office Center for Science, Technology, and Engineering Natural Resources and Environment Report to Congressional Requesters February 2018 TECHNOLOGY ASSESSMENT Chemical Innovation Technologies to Make Processes and Products More Sustainable GAO-18-307 The cover image displays a word cloud generated from the transcript of the meeting we convened with 24 experts in the field of sustainable chemistry. The size of the words in the cloud corresponds to the frequency with which each word appeared in the transcript. In most cases, similar words—such as singular and plural versions of the same word— were combined into a single term. Words that were unrelated to the topic of sustainable chemistry were removed. The images around the periphery are stylized representations of chemical molecules that seek to illustrate a new conceptual framework, whereby molecules can be transformed to provide better performance; however, they are not intended to represent specific chemical compounds. TECHNOLOGY ASSESSMENT Highlights of GAO-18-307, a report to congressional requesters Chemical Innovation February 2018 Technologies to Make Processes and Products More Sustainable Why GAO did this study What GAO found Chemistry contributes to virtually every Stakeholders lack agreement on how to define sustainable chemistry and how to aspect of modern life and the chemical measure or assess the sustainability of chemical processes and products; these industry supports more than 25 percent differences hinder the development and adoption of more sustainable chemistry of the gross domestic product of the technologies. However, based on a review of the literature and stakeholder United States. While these are positive interviews, GAO identified several common themes underlying what sustainable contributions, chemical production can chemistry strives to achieve, including: have negative health and environmental · improve the efficiency with which natural resources—including energy, consequences.