作者:Taegyo Lee、John F. Hartwig
DOI:10.1002/anie.201603153
日期:2016.7.18
Hydrosilyl ethers, generated in situ by the dehydrogenative silylation of cyclopropylmethanols with diethylsilane, undergo asymmetric, intramolecular silylation of cyclopropyl C−H bonds in high yields and with high enantiomeric excesses in the presence of a rhodium catalyst derived from a rhodium precursor and the bisphosphine (S)‐DTBM‐SEGPHOS. The resulting enantioenriched oxasilolanes are suitable
氢硅烷基醚是通过环丙基甲醇与二乙基硅烷的脱氢硅烷化原位生成的,在源自铑前体和双膦的铑催化剂存在下,以高收率和高对映体过量进行环丙基CH键的不对称分子内硅烷化( S )-DTBM-SEGPHOS。所得的对映体富集的氧杂硅氧烷是 Tamao-Fleming 氧化形成环丙醇的合适底物,同时保留了 C−H 甲硅烷基化的ee值。初步的机制数据表明,C−H 裂解可能是转换限制和对映选择性决定步骤。