Stereocontrolled construction of the dihydrothiopyrano[2,3-b]indole skeleton via an organocatalyzed asymmetric cascade sulfa-Michael-aldol reaction
作者:Lulu Wu、Youming Wang、Zhenghong Zhou
DOI:10.1016/j.tetasy.2014.09.005
日期:2014.10
We have developed an organocatalyzed asymmetric cascade sulfa-Michael-aldol reaction between 2-mercaptoindole-3-carbaldehydes and enals, which provides efficient access to the stereocontrolled construction of dihydrothiopyrano[2,3-b]indole skeletons. Under the catalysis of chiral diphenylprolinol TMS ether, the reactions ran smoothly to give the corresponding synthetically useful and pharmaceutically
我们已经开发了2-巯基吲哚-3-甲醛和烯醛之间的有机催化的不对称级联磺胺-迈克尔-醛醇反应,它提供了对二氢硫代吡喃并[2,3- b ]吲哚骨架的立体控制结构的有效访问。在手性二苯基脯氨醇TMS醚的催化下,反应进行得很顺利,以高收率和ee的64-96%得到了相应的合成有用的和药学上有价值的二氢硫吡喃并[2,3- b ]吲哚。
Organocatalytic enantioselective tandem sulfa-Michael/aldol reaction to access dihydrothiopyran-fused benzosulfolane skeletons bearing three contiguous stereocenters
The first organocatalytic diastereo- and enantioselective tandem sulfa-Michael/aldol reaction of 2-mercaptoindole-3-carbaldehydes and 2-mercaptobenzaldehydes with benzo[b]thiophene sulfones was developed. With multiple hydrogen-bonding thiourea as a catalyst, a wide range of polycyclic dihydrothiopyran-fused benzosulfolanes were smoothly obtained with excellent results (up to 99% yield, >20 : 1 dr
开发了第一个2-巯基吲哚-3-甲醛和2-巯基苯甲醛与苯并[ b ]噻吩砜的有机催化非对映和对映选择性磺胺-迈克尔/羟醛反应。用多种氢键合的硫脲作为催化剂,在温和的反应条件下,可以顺利获得各种多环二氢硫吡喃稠合的苯并砜类化合物,并具有优异的结果(产率高达99%,> 20:1 dr和99%ee)。