Mukaiyama aldol addition to α-chloro-substituted aldehydes. Origin of the unexpected syn selectivity
作者:Tessie Borg、Jakob Danielsson、Peter Somfai
DOI:10.1039/b922954j
日期:——
The addition of sterically demanding enolsilanes to α-chloro aldehydes results unexpectedly in preferential formation of the anti-PFA product (1,2-syn), while the addition of the corresponding boron enolate furnishes the expected polar FelkinâAnh product (1,2-anti). A stereoinduction model explaining these observations is proposed.
向α-氯醛中添加空间位阻较大的乙烯基硅烷,意外地导致优先形成反-PFA产物(1,2-syn),而添加相应的硼烯醇盐则得到预期的极性Felkin-Anh产物(1,2-anti)。提出了一个解释这些观察结果的立体诱导模型。