The hydroboration of trisubstituted olefins with IpcBH2 provides enantiomerically enriched organoboranes which after successive treatment with Et2BH and i-Pr2Zn afford diastereomerically pure (> 95% de) configurationally stable cyclic and open-chain organozinc reagents which can be trapped with various electrophiles (allylic halides, acid chlorides and 1-bromoalkynes) with retention of configuration.
用 IpcBH2 对三取代烯烃进行
硼氢化反应,可得到对映体富集的有机
硼烷,再用 Et2BH 和 i-Pr2Zn 连续处理,可得到非对映异构体纯度(> 95% de)、构型稳定的环状和开链
有机锌试剂。