The Felkin–Anh model has been widely accepted to describe stereochemical outcomes in nucleophilic additions to α-silyloxy carbonyl compounds. Herein, it is demonstrated that chelation-controlled additions can be performed using dialkylzinc reagents in the presence of chlorotrimethylsilane with good to excellent diastereoselectivities. Ethyl zinc chloride, the Lewis acid responsible for promoting chelation
Felkin-Anh模型已被广泛用来描述亲核加成α-甲
硅烷氧基羰基化合物时的立体
化学结果。在此,证明了可以使用二烷基
锌试剂在
氯三甲基
硅烷的存在下以良好至优异的非对映选择性进行螯合控制的添加。乙基
氯化锌(负责促进螯合的
路易斯酸)以自催化方式原位生成。该方法以
化学计量的量规避了其使用。