Formula A of Scheme 1 (rationalization of diastereoselection) was wrong. Actually, that model predicts the wrong diastereomer. An alternative rationalization model is proposed here. Thus, Scheme 1 should be replaced as follows: Accordingly, the sentence just preceding Scheme 1 should be modified as follows: “We think that the improvement of diastereoselection in the presence of ZnBr2 catalysis may
方案1的公式A(非对位选择的合理化)是错误的。实际上,该模型预测了错误的非对映异构体。这里提出了一种替代的合理化模型。因此,方案1应该替换如下:因此,方案1之前的句子应作如下修改:“我们认为在ZnBr 2催化下,非对映选择性的改善可能是由于羰基
金属对
金属的螯合所致。氧和二
氧戊环氧之一(请参阅公式A在方案1中)。如图所示,这种螯合将固定羰基的位置。在这种安排下,二
氧戊环甲基会更加刺激右脸,因此,根据Felkin-Anh模型,攻击将从左开始。本文尚未被其他出版物引用。