A (3+2)-cycloaddition approach to 1α, 2β, 25-trihydroxyvitamin D3 a ring synthon
作者:Takashi Takahashi、Makoto Nakazawa、Yasuharu Sakamoto、Kendall N. Houk
DOI:10.1016/s0040-4039(00)60619-6
日期:1993.6
Synthesis of a chiral A-ring model of 1alpha, 2beta, 25-trihydroxyvitamin D3 by the nitrile oxide cycloaddition and its diastereoselectivity based on MM2 transition state model are described.
Efficient, stereocontrolled total syntheses of racemic and natural brefeldin-A
作者:Claude Le Drian、Andrew E. Greene
DOI:10.1021/ja00384a038
日期:1982.10
Stereoselective peterson alkoxycarbonylmethylenation reaction of substituted cyclohexanones
作者:Lucjan Strekowski、Melean Visnick、Merle A. Battiste
depending upon the reaction conditions and the reactivity of donor molecules. The adduct anions, both 1:1 and 1:2 types, are quenched with alkyl halides or water in a highly stereoselective manner to produce α-silylated esters. A rigid intramolecular chelation working in the adduct anions is partly responsible for the high selectivity.