Enzyme assisted preparation of enantiomerically pure β-adrenergic blockers II. Building blocks of high optical purity and their synthetic conversion
摘要:
Based on previous screening results a series of potential building blocks 2-4 for beta-adrenergic blockers were prepared both by enzymatic hydrolysis and acyltransfer and further transformed into the corresponding oxiranes and aminoalcohols of defined absolute configurations.
Enzyme assisted preparation of enantiomerically pure β-adrenergic blockers II. Building blocks of high optical purity and their synthetic conversion
摘要:
Based on previous screening results a series of potential building blocks 2-4 for beta-adrenergic blockers were prepared both by enzymatic hydrolysis and acyltransfer and further transformed into the corresponding oxiranes and aminoalcohols of defined absolute configurations.
A simplified procedure for the stereospecific transformation of 1,2-diols into epoxides
作者:Hartmuth C. Kolb、K.Barry Sharpless
DOI:10.1016/s0040-4020(01)88349-6
日期:1992.11
of vicinal diols into epoxides via halohydrin ester intermediates has been developed. This method tolerates a wide range of functionality including acid sensitive functional groups. The transformation proceeds via a, usually highly regioselective, nucleophilic opening of a cyclic acetoxonium intermediate, generated from a cyclic orthoacetate and Me3SiCl, acetyl bromide or acetyl chloride/NaI to form