Asymmetric Synthesis of Spirocyclic Oxindole-Fused Tetrahydrothiophenes<i>via N,N′-</i>Dioxide-Nickel(II) Catalyzed Domino Reaction of 1,4-Dithiane-2,5-diol with 3-Alkenyloxindoles
作者:Pengfei Zhou、Yunfei Cai、Lili Lin、Xiangjin Lian、Yong Xia、Xiaohua Liu、Xiaoming Feng
DOI:10.1002/adsc.201400964
日期:2015.3.9
A highly efficient chiral N,N′‐dioxide–nickel(II) complex system has been developed to catalyze the domino thia‐Michael/aldol reaction of 1,4‐dithiane‐2,5‐diol with 3‐alkenyloxindoles. A series of the desired spirocyclic oxindole‐fused tetrahydrothiophenes was obtained in good yields with excellent ee and dr (up to 97% yield, 98% ee, >19:1 dr). Besides, based on the X‐ray crystal structure of the catalyst
已经开发出了一种高效的手性N,N'-二氧化镍-镍(II)络合物体系,以催化1,4-二噻吩-2-3,5-二醇与3-烯基氧吲哚的多米诺-迈克尔-羟醛反应。以良好的收率和优异的ee和dr获得了一系列所需的螺环氧杂吲哚稠合的四氢噻吩(高达97%的收率,98%的ee,> 19:1 dr)。此外,根据催化剂的X射线晶体结构以及产物的绝对构型,提出了催化模型来解释立体控制过程。