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.
Indium-Promoted Chemo- and Diastereoselective Allylation of α,β-Epoxy Ketones with Potassium Allyltrifluoroborate
摘要:
A practical method for the chemo- and diastereoselective allylation of alpha,beta-epoxy ketones has been developed by using the convenient air and moisture stable reagent potassium allyltrifluoroborate. Indium metal was found to promote addition in stoichiometric or catalytic amounts, to afford alpha,beta-epoxyhomoallylic tertiary alcohols in high yields and diastereoselectivities, without competing ring-scission of the epoxide.
[EN] BIO-RELATED SUBSTANCE MODIFIED BY MULTIFUNCTIONALIZED POLYETHYLENE GLYCOL DERIVATIVE<br/>[FR] SUBSTANCE D'ORIGINE BIOLOGIQUE MODIFIÉE PAR UN DÉRIVÉ DU POLYÉTHYLÈNEGLYCOL MULTIFONCTIONNALISÉ<br/>[ZH] 一种多官能化聚乙二醇衍生物修饰的生物相关物质