353 Absolute Asymmetric Synthesis 67, 88
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Effects of Mimosine Administered to a Perfused Area of Skin in Angora Goats by R
Downloaded from British Journal of Nutrition (1996), 15, 69-19 69 https://www.cambridge.org/core Effects of mimosine administered to a perfused area of skin in Angora goats BY R. PUCHALA, S. G. PIERZYNOWSKI, T. SAHLU* AND S. P. HART E. (Kika) de la Garza Institute for Goat Research, Langston University, Langston, Oklahoma 73050, USA . IP address: (Received I1 November 1994 - Revised 15 March 1995 -Accepted I1 May 1995) 170.106.34.90 The effect of mimosine on a perfused area of skin tissue was studied using an isolated perfusion technique. Four mature Angora wethers (body weight 35 (SE 2.3) kg) were cannulated bilaterally with indwelling silicone catheters in the superficial branches of the deep circumflex iliac artery and vein. Mimosine , on (40 mg/kg metabolic weight (Wo75)per d) was infused intra-arterially into one iliac artery of each goat for 3 d and saline was infused in the contralateral (control) iliac artery. Iliac venous blood samples were 27 Sep 2021 at 22:01:16 taken from both sides along with arterial samples from the carotid artery. Mimosine infusion elevated plasma mimosine in the carotid artery (52.6 (SEM19.21) pol/l) and iliac vein on the saline-treated side to 54.1 (SEM 16-31)~ol/l and in the iliac vein on the mimosine-treated side to 191.3 (SEM1914) pmol/l (P < 0.01). Mimosine decreased feed intake (2.3 v. 0.6 kg/d, ~~~0.29;P < 0.001) and water consumption (5-2 v. 1.3 litres/d, SEM 0.67; P < 0.001). -
Review on the Nutritive Value and Toxic Aspects of Leucaena Leucocephala
Trop Anim Prod 1979 4:2 113 A REVIEW ON THE NUTRITIVE VALUE AND TOXIC ASPECTS OF LEUCAENA LEUCOCEPHALA U ter Meulen1, S Struck1, E Schulke2 and E A El Harith1 1 Institut fur Tierphysiologie und Tierernahrung der Universitat Gottingen Oskar-Kellner-Weg 6, Weende 3400 Gottingen, West Germany This review discusses the nutritive value of Leucaena leucocephala and its mimosine toxicity when used as a forage for livestock. Chemical analysis and feeding trial. have indicated that Leucaena leaf-meal with its high protein, calcium, -carotene and xanthophyll contents, is potentially a valuable feed for livestock in the tropics. The symptoms of mimosine toxicity in cattle, sheep, poultry, goats horses, pigs and rats ire discussed, The chemical value of mimosine and the possible mechanism of its toxicity are reviewed. Possible solutions to the toxicity problem are presented together with the suggestion that further studies be initiated to overcome this problem. Key Words: Leucaena, mimosine toxicity, livestock, forage, feeding trials The uses of the tropical legume Leucaena leucocephala are quite versatile. These uses include its function as a source of firewood and timber,its role in soil erosion control (Dijkman 1950), its ability to provide shade for other plants as well as its function in maintaining the fertility of the soil and of serving as a nutritious forage for animal feed (Ruskln 1977). Presently the greatest use of this plant in animal nutrition is its incorporation in cattle feed. Leucaena leaf-meal, with its rich protein, minerals and vitamin content, is also becoming a popular ingredient in poultry feeds in the tropics (D'Mello and Taplin 1978). -
Dehydropeptide Supramolecular Hydrogels and Nanostructures As Potential Peptidomimetic Biomedical Materials
International Journal of Molecular Sciences Review Dehydropeptide Supramolecular Hydrogels and Nanostructures as Potential Peptidomimetic Biomedical Materials Peter J. Jervis * , Carolina Amorim, Teresa Pereira, José A. Martins and Paula M. T. Ferreira Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; [email protected] (C.A.); [email protected] (T.P.); [email protected] (J.A.M.); [email protected] (P.M.T.F.) * Correspondence: [email protected] Abstract: Supramolecular peptide hydrogels are gaining increased attention, owing to their potential in a variety of biomedical applications. Their physical properties are similar to those of the extracel- lular matrix (ECM), which is key to their applications in the cell culture of specialized cells, tissue engineering, skin regeneration, and wound healing. The structure of these hydrogels usually consists of a di- or tripeptide capped on the N-terminus with a hydrophobic aromatic group, such as Fmoc or naphthalene. Although these peptide conjugates can offer advantages over other types of gelators such as cross-linked polymers, they usually possess the limitation of being particularly sensitive to proteolysis by endogenous proteases. One of the strategies reported that can overcome this barrier is to use a peptidomimetic strategy, in which natural amino acids are switched for non-proteinogenic analogues, such as D-amino acids, β-amino acids, or dehydroamino acids. Such peptides usually possess much greater resistance to enzymatic hydrolysis. Peptides containing dehydroamino acids, Citation: Jervis, P.J.; Amorim, C.; i.e., dehydropeptides, are particularly interesting, as the presence of the double bond also intro- Pereira, T.; Martins, J.A.; Ferreira, duces a conformational restraint to the peptide backbone, resulting in (often predictable) changes P.M.T. -
Highly Stereoselective and Efficient Synthesis of the Dopa Analogue In
Turk J Chem 34 (2010) , 181 – 186. c TUB¨ ITAK˙ doi:10.3906/kim-0904-14 Highly stereoselective and efficient synthesis of the dopa analogue in pepticinnamin E via enantioselective hydrogenation of dehydroamino acids Dequn SUN Marine College, Shandong University at Weihai, Weihai 264209, P. R. CHINA e-mail: [email protected] Received 13.04.2009 An efficient and new method was developed to prepare the dopa analogue 11 in natural pepticinnamin via catalytic hydrogenation of dehydroamino acids (DDAA) with a good yield and ee. Product 11 is a key intermediate towards the total synthesis of pepticinnamin E and its analogues. Key Words: Synthesis; dopa analogue; enantioselective hydrogenation; dehydroamino acid. Introduction Pepticinnamin E1 (Figure) is a major product of the pepticinnamins, which are isolated from the culture of Streptomyces sp. OH-4652. It was identified as a depsipeptide having an O − Z -pentenylcinnamin acid and a novel dopa analogue, whose configuration has been determined as S by the Waldmann group using the Sch¨ollkopf method. 2 Pepticinnamin E shows rather potent inhibitory activity against farnesyl protein transferase (FPTase) with an IC 50 of 0.3 μM and is the first competitive inhibitor derived from a natural product. Our interest in the exploitation of a new methodology to synthesise naturally bioactive peptides containing non-ribosomal amino acids led us to initiate the synthesis of pepticinnamin E (1). Emphasis was placed on preparing both dopa analogue 2 and O − Z -pentenylcinnamin acid. 3 This study reports the enantioselective synthesis of the precursor of the dopa analogue 2, which would be suitable for the total synthesis of pepticinnamin E and its analogues. -
Phosphorus-Containing Amino Acids with a P–C Bond in the Side Chain Or a P–O, P–Sorp–N Bond: Cite This: RSC Adv., 2020, 10, 6678 from Synthesis to Applications
RSC Advances View Article Online REVIEW View Journal | View Issue Phosphorus-containing amino acids with a P–C bond in the side chain or a P–O, P–SorP–N bond: Cite this: RSC Adv., 2020, 10, 6678 from synthesis to applications a b b Mathieu Arribat, Florine Cavelier * and Emmanuelle Remond´ * Since the discovery of (L)-phosphinothricin in the year 1970, the development of a-amino acids bearing a phosphorus group has been of renewed interest due to their diverse applications, including their use in [18F]-fluorolabeling, as fluorescent probes, as protecting groups and in the reversible immobilization of amino acids or peptide derivatives on carbon nanomaterials. Considerable progress has also been achieved in the field of antiviral agents, through the development of phosphoramidate prodrugs, which increase significantly the intracellular delivery of nucleoside monophosphate and monophosphonate analogues. This review aims to summarize the strategies reported in the literature for the synthesis of P(III), P(IV) and P(V) phosphorus-containing amino acids with P–C, P–O, P–SorP–N bonds in the side Received 2nd December 2019 Creative Commons Attribution-NonCommercial 3.0 Unported Licence. chains and their related applications, including their use in natural products, ligands for asymmetric Accepted 22nd January 2020 catalysis, peptidomimetics, therapeutic agents, chemical reagents, markers and nanomaterials. The DOI: 10.1039/c9ra10917j discussion is organized according to the position of the phosphorus atom linkage to the amino acid side rsc.li/rsc-advances chain, either in an a-, b-, g-ord-position or to a hydroxyl, thiol or amino group. 1. Introduction phosphinothricin has engendered the development of numerous drugs for neurodegenerative disease treatment. -
(12) United States Patent (10) Patent No.: US 8,962,619 B2 Ashwell Et Al
USOO8962619B2 (12) United States Patent (10) Patent No.: US 8,962,619 B2 Ashwell et al. (45) Date of Patent: *Feb. 24, 2015 (54) SUBSTITUTED (58) Field of Classification Search MIDAZOPYRIDINYL-AMNOPYRIDINE None COMPOUNDS See application file for complete search history. (71) Applicant: ArCule, Inc., Woburn, MA (US) (56) References Cited U.S. PATENT DOCUMENTS (72) Inventors: Mark A. Ashwell, Carlisle, MA (US); Chris Brassard, Somerville, MA (US); 4,522,811 A 6/1985 Eppstein et al. Anton Filikov, Rockville, MD (US); 33. R: ck 3. RileyShWell f et alal. ............... 514,303 ason Hill. Auburndale, MA (US); Steffi 8,609.688 B2 * 12/2013 Ashwell et al. ............... 514,303 Koerner, Medford, MA (US); 2002/0151549 A1 10/2002 Hayakawa et al. Jean-Marc Lapierre, Pelham, NH (US); 2006/0035921 A1 2/2006 Castelhano et al. Yanbin Liu, Acton, MA (US); Nivedita 2007. O142369 A1 6/2007 van Heek et al. 2007,0254.868 A1 11/2007 Lauffer et al. Namdev, Westford, MA (US); Robert 2009/0253734 A1 10/2009 Kelly, III et al. Nicewonger, Tyngsboro, MA (US); 2011/0059936 A1 3/2011 Lauffer et al. Rocio Palma, North Andover, MA (US); 2011/0172203 A1 7, 2011 Ashwell et al. Manish Tandon, Framingham, MA 2012/0329793 A1* 12/2012 Ashwell et al. ............ 514,234.2 (US); David Vensel, Brookline, MA (US); Akihisa Matsuda, Tokyo (JP); FOREIGN PATENT DOCUMENTS Shin Iimura, Tokyo (JP); Kenichi CN 1824665 A 8, 2006 Yoshida, Tokyo (JP); Takanori DE 3722.992 A1 1, 1989 Yamazaki, Tokyo (JP); Takahiro P 12: A. 3. E. Kitamura, Tokyo (JP); Takeshi JP 200034.4780 A 12/2000 Isoyama, Tokyo (JP) KR 20090007347 U 7, 2009 WO WO-96.19991 A1 T 1996 (73) Assignee: ArCule, Inc., Woburn, MA (US) WO WO-99.57 103 A1 11, 1999 WO WO-03.08.0125 A2 10/2003 (*) Notice: Subject to any disclaimer, the term of this WO WO-03080610 A1 10, 2003 WO WO-03O88967 A1 10, 2003 patent is extended or adjusted under 35 WO WO-20050117OO A1 2/2005 U.S.C. -
Mimosine Concentration in Leucaena Leucocephala Under Various Environmental Conditions
Tropical Grasslands-Forrajes Tropicales (2019) Vol. 7(2):164–172 164 DOI: 10.17138/TGFT(7)164-172 ILC2018 Keynote paper* Mimosine concentration in Leucaena leucocephala under various environmental conditions Concentración de mimosina en Leucaena leucocephala bajo diferentes condiciones ambientales MICHAEL D.H. HONDA AND DULAL BORTHAKUR Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI, USA. manoa.hawaii.edu Abstract Leucaena leucocephala (leucaena) is a multipurpose tropical tree-legume that is highly resistant to many biotic and abiotic stresses. Leucaena is used primarily as an animal fodder owing to its protein-rich foliage. However, leucaena foliage also contains mimosine, a toxic non-protein amino acid that can cause alopecia, goiter and other thyroid problems, infertility and fetal death. Considering its toxicity and abundance in leucaena, it is important to quantify the mimosine concentrations in leucaena under different environmental conditions. Mimosine was extracted from various types of leucaena tissue exposed to a range of environmental conditions and then quantified by HPLC. The mimosine concentrations in leucaena treated with NaCl increased after 6 days of treatment and remained relatively high when treatment continued for 18 days. Interestingly, leucaena exposed to complete darkness for up to 5 days had a higher mimosine concentration than control plants exposed to normal light/dark photoperiods. On the other hand, drying leucaena leaflets or macerating them in an alkaline buffer significantly lowered their mimosine concentration. Mature leaflets that had fallen off the plant and dried out also contained significantly less mimosine than fresh leaflets. The results of this study indicate that mimosine concentrations in leucaena are affected by environmental conditions and this knowledge can assist in managing to prevent toxicity. -
Sandra Cristina Gomes Oliveira Aminoácidos Não-Proteinogénicos
Universidade do Minho Escola de Ciências Sandra Cristina Gomes Oliveira Aminoácidos não-proteinogénicos como antioxidantes Aminoácidos não-proteinogénicos como antioxidantes Aminoácidos não-proteinogénicos como antioxidantes Sandra Cristina Gomes Oliveira Cristina Gomes Oliveira Sandra Minho | 2016 U Outubro de 2016 Universidade do Minho Escola de Ciências Sandra Cristina Gomes Oliveira Aminoácidos não-proteinogénicos como antioxidantes Tese de Mestrado Mestrado em Química Medicinal Trabalho efetuado sob a orientação de Doutor Luís Miguel Oliveira Sieuve Monteiro e de Doutora Maria de Fátima Azevedo Brandão Amaral Paiva Martins Outubro de 2016 Agradecimentos O projeto que desenvolvi ao longo do segundo ano de mestrado, só foi possível graças à colaboração de diversas pessoas que, ajudaram na sua realização, às quais aproveito desde já para agradecer. Em primeiro lugar, gostaria de agradecer ao Doutor Luís Monteiro e à Doutora Paula Ferreira, pelo enorme e incansável apoio, pelos seus ensinamentos, paciência e disponibilidade. À Doutora Fátima Paiva-Martins da Faculdade de Ciências da Universidade do Porto, agradeço por me ter proporcionado a oportunidade de desenvolver uma parte deste trabalho na Faculdade de Ciências da Universidade do Porto, pela sua orientação, ensinamento, disponibilidade e apoio. Gostaria também de agradecer aos meus amigos de mestrado pelo companheirismo e os momentos agradáveis. Aos meus colegas que estiveram comigo no laboratório da Faculdade de Ciências da Universidade do Porto por toda a ajuda que deram a integrar- me no laboratório nos primeiros tempos de trabalho. Agradeço também aos restantes amigos. Quero agradecer de uma forma muito especial à minha família que sempre se mostrou presente, disponível e compreensiva, principalmente aos meus pais por fazerem de mim aquilo que sou hoje. -
Copyrighted Material
353 Index a aromatic 1,2-diphosphines 84 absolute asymmetric synthesis 67, 88 aspergillomarasmine 10 acetaldehyde 48, 203, 223, 292, 321 asymmetric synthesis (ÀS) acetic acid moiety 207, 321 – absolute asymmetric synthesis 67 acetic anhydride 51, 93, 209 – classification 51, 67 acetoacetic ether 129 – diastereoselective asymmetric synthesis 67 acetonitrile 51, 100, 103, 227, 236, 360 –effectivenessof 67 acetoxy-ion elimination 58 – enantiomeric asymmetric synthesis 68 (R)-O-acetylserine complex 294 – partial asymmetric synthesis 67 (S)-O-acetylserine complex 204, 293 atropoisomer 296 acrylic acid 113, 120 azetidine-2-carboxylic acid 8 alanine alkylation 215, 220 alanopine 4, 7, 11 aldol condensation 111, 188, 222, 223 b aldol reaction 159, 224 Bacillus brevis 2 alkylhalides 115, 152, 216 Balz–Schiemann reaction 264 allyl chloride 218 benzaldehyde 147, 148–151, 162 aluminum nitrate 39 benzophenone moiety 96, 97 amino acid moiety 47, 110, 186 benzylamine 100, 102, 176 -amino aldehydes 173 benzylation reaction 82, 111 2-amino-2’-carboxyindan 95 benzylbromide 82, 111, 140, 143, 145, 184, 2-aminoacetophenone 190, 201, 285 218, 290, 318 2-aminoacrylic acid 99 benzylcinchonidine 75 aminobinaphthols 104, 106, 112, 114, 125 benzylcinchonine 81 3-aminobutanoic acid 179 (S)-2-N-(N’-benzylprolyl)aminobenzophenone -aminobutyric acid (GABA) 2 (BPB) 200 1-aminocyclopropanecarboxylic acid (ACC) (S)-BINOLAM 81 85 biomimetic chemical approach 25 1-amino-2,2-dideuterocyclopropanecarboxylicCOPYRIGHTEDbiomimetic enzymeMATERIAL systems 25 acid 85 Δ-bis[N-3-methylsalicylideneglycinate]sodium -
Mimosine in Leucaena As a Potent Bio-Herbicide T.D
Mimosine in Leucaena as a potent bio-herbicide T.D. Xuan, A.A. Elzaawely, F. Deba, M. Fukuta, S. Tawata To cite this version: T.D. Xuan, A.A. Elzaawely, F. Deba, M. Fukuta, S. Tawata. Mimosine in Leucaena as a potent bio-herbicide. Agronomy for Sustainable Development, Springer Verlag/EDP Sciences/INRA, 2006, 26 (2), pp.89-97. hal-00886327 HAL Id: hal-00886327 https://hal.archives-ouvertes.fr/hal-00886327 Submitted on 1 Jan 2006 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Agron. Sustain. Dev. 26 (2006) 89–97 89 © INRA, EDP Sciences, 2006 DOI: 10.1051/agro:2006001 Research article Mimosine in Leucaena as a potent bio-herbicide T.D. XUAN, A.A. ELZAAWELY, F. DEBA, M. FUKUTA, S. TAWATA* Department of Bioscience and Biotechnology, Faculty of Agriculture, University of the Ryukyus, Okinawa 903-0213, Japan (Accepted 14 December 2005) Abstract – Mimosine [α-amino-β-(3-hydroxy-4-oxo-1,4-dihydropyridin-1-yl)-propanoic acid] is a major constituent of Leucaena (Leucaena leucocephala de Wit) and responsible for the strong allelopathic potential of the legume tree. Mimosine showed strong herbicidal activities on six plants in a bioassay. -
(12) Patent Application Publication (10) Pub. No.: US 2017/0137864 A1 Yin Et Al
US 2017.0137864A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2017/0137864 A1 Yin et al. (43) Pub. Date: May 18, 2017 (54) HIGH-THROUGHPUT AND HIGHLY Related U.S. Application Data MULTIPLEXED IMAGING WITH (63) Continuation of application No. 15/108,911, filed on PROGRAMMABLE NUCLEC ACID PROBES Jun. 29, 2016, filed as application No. PCT/US 15/ (71) Applicant: President and Fellows of Harvard 20034 on Mar. 11, 2015. College, Cambridge, MA (US) (60) Provisional application No. 61/951.461, filed on Mar. 11, 2014. (72) Inventors: Peng Yin, Brookline, MA (US); Sarit Agasti, Jakkur (IN); Xi Chen, West Publication Classification Newton, MA (US); Ralf Jungmann, (51) Int. C. Munich (DE) CI2O I/68 (2006.01) (52) U.S. C. (73) Assignee: President and Fellows of Harvard CPC ......... CI2O 1/6804 (2013.01); C12O 1/6818 College, Cambridge, MA (US) (2013.01) (57) ABSTRACT (21) Appl. No.: 15/410,700 The present invention provides, inter alia, methods and compositions for imaging, at high spatial resolution, targets (22) Filed: Jan. 19, 2017 of interest. Patent Application Publication May 18, 2017. Sheet 1 of 7 US 2017/O137864 A1 Patent Application Publication May 18, 2017. Sheet 2 of 7 US 2017/O137864 A1 ~~~~~~); Patent Application Publication May 18, 2017. Sheet 3 of 7 US 2017/O137864 A1 Patent Application Publication May 18, 2017. Sheet 4 of 7 US 2017/O137864 A1 Patent Application Publication May 18, 2017. Sheet 5 of 7 US 2017/O137864 A1 Patent Application Publication May 18, 2017. Sheet 6 of 7 US 2017/O137864 A1 Patent Application Publication May 18, 2017. -
Synthesis of Bis-Dehydroamino Acid Derivatives by Suzuki
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Universidade do Minho: RepositoriUM High yielding synthesis of N-ethyl dehydroamino acids Luís S. Monteiro* and Ana S. Suárez Chemistry Centre, University of Minho, Gualtar, 4710-057 Braga, Portugal Author’s address: L. S. Monteiro, Chemistry Centre, University of Minho, Gualtar, 4710-057 Braga, Portugal, Fax: +351 253604382, e-mail: [email protected]. Abstract. Recently we reported the use of a sequence of alkylation and dehydration methodologies to obtain N-ethyl-- dehydroamino acid derivatives. The application of this N-alkylation procedure to several methyl esters of -dibromo and - bromo, -substituted dehydroamino acids protected with standard amine protecting groups was subsequently reported. The corresponding N-ethyl, -bromo dehydroamino acid derivatives were obtained in fair to high yields and some were used as substrates in Suzuki cross coupling reactions to give N-ethyl, -disubstituted dehydroalanine derivatives. Herein, we further explore N-ethylation of -halo dehydroamino acid derivatives using triethyloxonium tetrafluoroborate as alkylating agent but substituting N,N-diisopropylethylamine for potassium tert-butoxide as auxiliary base. In these conditions, for all -halo dehydroamino acid derivatives, reactions were complete and the N-ethylated derivative could be isolated in high yield. This method was also applied for N-ethylation of non-halogenated dehydroamino acids. Again, with all compounds the reactions were complete and the N-ethyl dehydroamino acid derivatives could be isolated in high yields. Some of these N-ethyl dehydroamino acid methyl ester derivatives were converted in high yields to their corresponding acids and coupled to an amino acid methyl ester to give N-ethyl dehydrodipeptide derivatives in good yields.