1,2-Asymmetric induction in the ketene Claisen rearrangement of (2S,3E)-5-(isopropylsulfanyl)-3-pentenes
作者:Jozef Gonda、Miroslava Martinková、Beat Ernst、Daniel Belluš
DOI:10.1016/s0040-4020(01)00465-3
日期:2001.6
The ketene Claisen rearrangement of chiral (2S,3E)-5-(isopropylsulfanyl)-3-penten-2-amines has been investigated by the semi-empirical AM1 method. The observed efficient direction of the 1,2-asymmetric induction in the ketene Claisen rearrangement has been modelled from comparison of the energies of the four possible transition states arising from two chair-like and two boat-like structures. The resulting
通过半经验AM1方法研究了手性(2 S,3 E)-5-(异丙基硫烷基)-3-戊烯-2-胺的乙烯酮克莱森重排。通过比较由两个椅子状和两个船状结构产生的四个可能的过渡态的能量,对在烯酮克莱森重排中观察到的1,2-不对称感应的有效方向进行了建模。相对过渡态能量的最终趋势与实验观察结果合理吻合。