Huang, Lisha Li, Jiangtao Zhao, Yan Ye, Xinyi Liu, Yang Yan, Lin Tan, Choon-Hong Liu, Hongjun Jiang, Zhiyong Chiral Bicyclic Guanidine-Catalyzed Enantioselective Sulfenylation of Oxindoles and Benzofuran-2(3<i>H</i>)‑ones A chiral bicyclic guanidine-catalyzed enantioselective sulfenylation of 3-substituted oxindoles to <i>N</i>-(sulfanyl)­succinimides has been developed. A series of unprecedented 3-sulfenylated oxindoles, such as 3-benzyl/alkyl-substituted 3-benzyl/alkyloxindoles, were obtained with high enantioselectivities (up to 98% ee). This methodology is also effective for the first asymmetric sulfenylation of benzofuran-2­(3<i>H</i>)-ones, providing 3-benzyl-3-benzylthio-substituted benzofuran-2­(3<i>H</i>)-ones with satisfactory results (up to 95% ee). ee;benzofuran;oxindole;sulfenylation;benzyl 2015-09-04
    https://acs.figshare.com/articles/journal_contribution/Chiral_Bicyclic_Guanidine_Catalyzed_Enantioselective_Sulfenylation_of_Oxindoles_and_Benzofuran_2_3_i_H_i_ones/2134792
10.1021/acs.joc.5b01606.s001