The stereocontrolled formation of 1,2,3-triols by yeast-mediated transformation of α-keto epoxides
摘要:
3-Phenyl-2,3-epoxy ketones are transformed using baker's yeast into the corresponding 1,2,3-triols as one pure diastereoisomer (S,S,S and R,R,R) formed by syn ring opening of the epoxide after first reduction of the carbonyl group; the reaction results in the epoxy-oxygen becoming the mid OH group of the triol, implicating enzyme attack at the C-3 in the ring-opening reaction.
Asymmetric phase-transfer mediated epoxidation of α,β-unsaturated ketones using catalysts derived from Cinchona alkaloids
作者:Barry Lygo、Philip G. Wainwright
DOI:10.1016/s0040-4039(97)10779-1
日期:1998.3
The enantioselective epoxidation of α,β-unsaturated ketones utilising Cinchona alkaloid-derived quaternary ammonium phase-transfer catalysts bearing an N-anthracenylmethyl function are presented. It has been found that the O-benzyl derivatives of these catalysts in conjunction with sodium hypochlorite give high stereocontrol and application of this process to the enantioselective synthesis of a range
Asymmetric epoxidation of α,β-unsaturated ketones via an amine-thiourea dual activation catalysis
作者:Lu-Wen Zhang、Li Wang、Nan Ji、Si-Yang Dai、Wei He
DOI:10.1016/j.tetlet.2021.152941
日期:2021.3
A simple asymmetricepoxidation method is developed to effectively synthesize chiral α-carbonyl epoxides through an amine-thiourea dual activation catalysis. In this method, TBHP, as an oxidant, determined the reaction rate, and the chiral amine-thiourea catalyst effectively controlled the stereoselectivity of the reaction, and KOH promoted deprotonation. 22 examples of α,β-unsaturated ketones with
Adger, Brian M.; Barkley, James V.; Bergeron, Sophie, Journal of the Chemical Society. Perkin transactions I, 1997, # 23, p. 3501 - 3507
作者:Adger, Brian M.、Barkley, James V.、Bergeron, Sophie、Cappi, Michael W.、Flowerdew, Benjamin E.、Jackson, Mark P.、McCague, Ray、Nugent, Thomas C.、Roberts, Stanley M.
DOI:——
日期:——
Shchepin, V. V.; Gladkova, G. E.; Russkikh, N. Yu., Journal of Organic Chemistry USSR (English Translation), 1992, vol. 28, # 6.1, p. 902 - 907
作者:Shchepin, V. V.、Gladkova, G. E.、Russkikh, N. Yu.