Allenoates in Enantioselective [2+2] Cycloadditions: From a Mechanistic Curiosity to a Stereospecific Transformation
作者:Johannes. M. Wahl、Michael L. Conner、M. Kevin Brown
DOI:10.1021/jacs.8b10008
日期:2018.11.21
selectivity, a detailed mechanistic investigation was conducted. Herein, two competing reaction pathways are proposed, which operate simultaneously and funnel the alkenes to the same axially chiral cyclobutanes. In agreement with the Woodward-Hoffmann rules, this mechanistic curiosity can be rationalized through a unique symmetry operation that was elucidated by deuteration experiments. In the case of 1,1-diarylalkenes
新型催化剂-烯丙酸酯对的鉴定允许α-甲基苯乙烯的对映选择性[2+2]环加成。为了了解选择性的起源,进行了详细的机械研究。在此,提出了两种竞争性反应途径,它们同时操作并将烯烃漏斗为相同的轴向手性环丁烷。与伍德沃德-霍夫曼规则一致,这种机械好奇心可以通过氘化实验阐明的独特对称操作来合理化。在 1,1-二芳基烯烃的情况下,催化剂和烯烃之间的远距离通讯是通过电子性质和构象的细微改变来实现的。在这种情况下,哈米特的一项研究为协调机制提供了进一步的可信度。因此,扩展范围的探索,