Studies on the sharpless asymmetric epoxidation of unsymmetrical divinylmethanols
作者:Toshio Honda、Hirotake Mizutani、Kazuo Kanai
DOI:10.1039/p19960001729
日期:——
A reaction of racemic unsymmetrical divinylmethanol rac-13 under the Sharpless asymmetric epoxidation conditions using stoichiometric amounts of titanium tetraisopropoxide [Ti(OPi)4], D-(–)-diisopropyl tartrate (DIPT) and tert-butyl hydroperoxide (TBHP) afforded R-14 and R-15 in 41 and 43% yield, each with > 99%ee, respectively, where the kinetic resolution and subsequent epoxidation had proceeded
外消旋不对称二乙烯基甲醇rac -13在Sharpless不对称环氧化条件下,使用化学计量的四异丙氧基钛[Ti(OP i)4],D -(-)-酒石酸二异丙酯(DIPT)和叔丁基氢过氧化物(TBHP)进行反应R -14和R -15的收率分别为41%和43%,ee均> 99%,其中动力学拆分和随后的环氧化反应均以完全区域选择性和非对映选择性的方式进行。