Dimerization Reactions in Sunlight. IV.1 Photodimerization of Thianaphthene-1,1-dioxide and its Substituted Derivatives and of 3-Benzylidene-6,7-benzophthalide
Dimerization Reactions in Sunlight. IV.1 Photodimerization of Thianaphthene-1,1-dioxide and its Substituted Derivatives and of 3-Benzylidene-6,7-benzophthalide
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)。
Copper-Catalyzed Umpolung of <i>N</i>-2,2,2-Trifluoroethylisatin Ketimines for the Enantioselective 1,3-Dipolar Cycloaddition with Benzo[<i>b</i>]thiophene Sulfones
A copper-catalyzed umpolung of N-2,2,2-trifluoroethylisatin ketimines for the enantioselective1,3-dipolarcycloaddition with benzo[b]thiophene sulfones was developed. Using a catalyst system consisting of an (S,Sp)-tBu-Phosferrox ligand, Cu(OTf)2, and Cs2CO3, a range of pentacyclic spirooxindoles containing pyrrolidine and benzo[b]sulfolane subunits were obtained in high efficiency with excellent
开发了一种铜催化的N -2,2,2-三氟乙基靛红酮亚胺与苯并[ b ]噻吩砜的对映选择性 1,3-偶极环加成反应。使用由 ( S , S p )- t Bu-Phosferrox 配体、Cu(OTf) 2和 Cs 2 CO 3组成的催化剂体系,以高浓度获得了一系列含有吡咯烷和苯并[ b ]环丁砜亚基的五环螺氧吲哚。在温和条件下具有出色的区域选择性、非对映选择性和对映选择性。也证明了该反应的实用性和多功能性。