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Template for Writing Articles for Thieme Chemistry Journals 1 SYNLETT: LETTER Organocatalytic phosphorylation of alcohols using pyridine-N-oxide James I. Murray,a Rudiger Woscholskia,b and Alan C. Spiveya* aDepartment of Chemistry, South Kensington Campus, Imperial College London, SW7 2AZ, United Kingdom bInstitute of Chemical Biology, Imperial College London, London SW7 2AZ, United Kingdom Fax: +44 (0)20 759 45841 E-mail: [email protected] Received: The date will be inserted once the manuscript is accepted. Abstract: Phosphorylation of alcohols by phosphoryl chlorides catalyzed by pyridine-N-oxide is reported. The utility of this method is demonstrated through phosphorylation of primary, secondary and a tertiary alcohol as well as phenols under mild reaction conditions and with low catalyst loading (5 mol%). Key words: Phosphorylation, alcohols, pyridine-N-oxide, organocatalysis. O Exisiting methods O O O Phosphorylation of alcohol groups in e.g. peptides, Exisiting methods O Lewis acids: P P Cl OR O N OR Cl proteins, inositols, glycerols and steroids plays a t OR OR 1) Ti(O Bu)4 (5-20 mol%) + A or C 4 or Ph or A Ph B pivotal role in many physiologically important 2) TiCl mol%) + A 2) TiCl4 (2(2 mol%) + O Jones et al. (refs 9-13; R = Ph, Et) 1 or processes. Disease states including cancers and 1 3) Cu(OTf) 2 (20 mol%) + B 1 P OR R OH 2 R1O O O OR 1 ° ° ° Et N or i-Pr NEt P P OBn immune system disorders are often characterized by R = 1°,2°,3° Et3N or i-Pr2NEt R = Ph, Bn, Et BnO O OBn C CH Cl BnO 2,3 & phenolic CH2Cl2 BnO OBn perturbation of these processes. Phosphate Sculimbrene et al. 14-15) Sculimbrene et al. (refs 14-15) nucleophiles: derivatives are also commonly prepared in order to O O 4-DMAP (4.9 mol%) DPPCl or P P DPPCl 1 or 1 P OPh Cl OPh increase the aqueous solubility of alcohols e.g. in pro- R OH NMI (2.5 mol%) R O OPh 4–6 OPh OPh Miller et al. (refs 19-20) drugs. The development of synthetic methods for Et3N, CH2Cl2 the efficient, cost-effective and scalable This work O This work Cl O P P N Cl OPh O O phosphorylation of alcohol derivatives is therefore an (5 mol%) O OPh O OPh 1 1 P OR important goal. R1OH R1O DPPCl o-XPCl DPPCl or o-XPCl OR ° ° ° Proton © R1 = 1°,2°,3° Proton Sponge R,R = Ph,Ph Alcohol phosphorylation (i.e. phosphate mono-ester CH2Cl2 or o & phenolic 2 2 or o-XP formation) by direct acid catalyzed condensation with Figure 1. Catalytic methods for phosphorylation of alcohols. phosphoric acid is generally difficult to control for structurally diverse alcohols.7 Consequently, phosphorylation is more generally achieved either by Whilst the Lewis acid catalyzed methods have phosphitylation then oxidation/deprotection [i.e. using demonstrated good substrate scope and are moderate a P(III) reagent e.g. a phosphoramidite] or by direct to high yielding, separation of the metal catalysts from the products can be problematic and costly e.g. in late phosphorylation then deprotection [i.e. using a P(V) 21–24 reagent e.g. dialkoxychlorophosphate].8 stage pharmaceutical synthesis. The existing Phosphitylation reactions tend to be faster than organonucleophile catalyzed processes do not appear phosphorylation reactions but require the substrate to to have been systematically investigated but our display stability to the subsequent oxidation. Direct experience indicates that their scope/efficacy is phosphorylation can be achieved with Brønsted/Lewis inferior to the procedure described herein. acid or nucleophilic catalysis. For example, Jones et Pyridine-N-oxides have been used extensively as t al. have used Ti(O Bu)4, TiCl4 or Cu(OTf)2 with nucleophilic catalysts for the coupling of 3’- 9,10 phosphoryl chlorides and N-phosphoryl phosphorylated nucleotides with 5’-OH nucleotides in 11–13 oxazolidinones, and more recently, Sculimbrene et the synthesis of oligonucelotides25,26 and we have t al. have reported the use of Ti(O Bu)4 with recently reported the use of 2-aryl-4- 14,15 16 17 pyrophosphates. Pyridine, 4-DMAP and (dimethylamino)pyridine-N-oxides as catalysts for the 18 DABCO have been used as super-stoichiometric chemoselective phosphorylation of α-amino acid 27 nucleophilic promotors of phosphorylation and Miller derivatives, polyols and peptides. During the course 19 et al. have deployed N-methylimidazole (NMI) and of these studies, it was noted that pyridine-N-oxide 20 4-DMAP sub-stoichiometrically with phosphoryl itself provided significant rate enhancement in alcohol chlorides (Figure 1). phosphorylation reactions using phosphoryl chlorides. Herein, we report the use of pyridine-N-oxide as a competent nucleophilic catalyst for the phosphorylation of hydroxyl containing substrates using phosphoryl chlorides. Our initial studies focused on evaluation of bases for the phosphorylation of 4-phenyl-1-butanol (1) by diphenyl phosphoryl chloride (DPPCl) using pyridine- N-oxide (2) as a catalyst (Table 1). Template for SYNLETT and SYNTHESIS © Thieme Stuttgart · New York 2015-05-15 page 1 of 5 2 SYNLETT: LETTER Table 1 Phosphorylation of 4-phenyl-1-butanol. 8 3i 1 82 (7)c a b N 2 Isolated yield after chromatographic purification. Product 3d O O (5 mol%) 9,14 Ph Ph P decomposes on silica gel (cf. ), impurities present, see OH O OPh c DPPCl (1.1 eq.) OPh Supporting Information. Conversion to product 3 as 1a 3a Base (2 eq.) determined by 1H NMR of the crude reaction mixture of the 2 h, RT, CH2Cl2 (0.2 M) uncatalyzed reaction. Entry Catalyst Base Conv. (%)a 1 None None 0 Benzyl alcohol was phosphorylated in good yield 2 2 None 0 within 2 h (entry 1, Table 2). Secondary alcohols and 3 2 PPO 47 tert-BuOH were also phosphorylated with moderate to © b 4 2 PS >99 (98) good yields, albeit with increased reactions times 5 2 NEt3 87 (entries 2-4, Table 1). Other tertiary alcohols (e.g. α- 6 2 PMP >99 7 None PS© 0 terpineol and 2-phenyl-2-propanol) were unreactive to aConversion to product 3 as determined by 1H NMR of the crude these conditions. Phenols were converted to reaction mixture. bIsolated yield after chromatographic phosphorylated products in high yields and short © purification. PPO = propylene oxide, PS = 1,8-bis(NMe2)- © reaction times (1 h), irrespective of the electronics of naphthalene (Proton Sponge ), PMP = 1,2,2,6,6- other aryl substituents (entries 5-8, Table 2). Although pentamethylpiperidine. these phenols are also phosphorylated in the absence In the absence of base and/or catalyst no reaction was of catalyst, rates are significantly increased in the observed (entries 1, 2 and 7, Table 1). Whilst presence of the pyridine-N-oxide catalyst. propylene oxide provided moderate levels of © Having established reaction conditions that appeared conversion (entry 3, Table 1), both Proton Sponge general for the phosphorylation of a range of hydroxyl and PMP provided quantitative conversion within 2 h containing substrates, including the preparation of (entries 4, 6, Table 1). With the aim of developing a phosphoryl derivatives known to be highly sensitive general method for the economic and scalable © to adventitious nucleophiles (e.g. compounds 3b and phosphorylation of alcohols, Proton Sponge was 3d), phosphorylation of a selection of biologically identified as optimal and these conditions were relevant molecules and phosphate ester pro-drugs was applied to a variety of alcohol substrates (Table 2). evaluated (Table 3). Table 2 Pyridine-N-oxide catalyzed phosphorylation - substrate Table 3 Phosphorylation of biologically relevant molecules and scope. phosphate pro-drugs. O P OPh N mol%) O N mol%) R1O (5 (5 OPh O O 1 O P OPh Cl R OH R1O or P OPh R1OH O O DPPCl (1.1 eq.) chloride 1 1b-i Phosphoryl (1.1 eq.) R O O PS© 3b-i © P o-XPCl (2 eq.) PS (2 eq.) O O RT, CH2Cl2 (0.2 M) RT, CH2Cl2 (0.2 M) Time Time Compound Time Time Yield Entry Product Yield (%)a Entry Product Compound # # (h) (h) (%)a 1 3b 2 98 1 4 2 85 5a R = Ph 1 74 (27)b 2 2 3c 8 94 5b R,R = o-XP 1 71 (15)b 3 3d 8 ~81b 3 6 2 83 4 3e 24 57 4 7 2 61 c 5 3f 1 95 (17)c 5 8 2 77 (74) 6 3g 1 97 (21)c 6 9 8 54 10a R = Ph 1 91 (59)b c 7 7 3h 1 91 (14) 10b R,R =o-XP 1 93 (21)b aIsolated yield after chromatographic purification. bConversion to product as determined by 1H NMR of the crude reaction mixture of the Template for SYNLETT and SYNTHESIS © Thieme Stuttgart · New York 2015-05-15 page 2 of 5 3 SYNLETT: LETTER c uncatalyzed reaction. Yield of reaction conducted on 20 mmol scale Figure 2 The aromatic regions of 1H NMR spectra of pyridine-N- with respect to alcohol. oxide (upper) and the proposed intermediate salt (lower). The The allylic alcohol geraniol was phosphorylated in peaks at δH ~8.3 ppm and ~8.6 ppm are the C2/C6 protons. good yield within 2 h (entry 1, Table 3). Steroid Subsequent treatment of this salt with an alcohol derivatives containing phenolic and primary alcohols results in rapid conversion to the phosphate mono- were also phosphorylated in good yield and with ester product. Our attempts to obtain crystals of the chemoselectivity over secondary and tertiary hydroxyl intermediate salt, suitable for single crystal X-ray functionalities (entries 2 and 3, Table 3). structure determination, have however so far been Phosphorylation of the primary 5’-OH group of unsuccessful.
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