Direct Synthesis of Benzo[<i>f</i>]indazoles from Sulfonyl Hydrazines and 1,3-Enynes by Copper-Catalyzed Annulation
作者:Biao Yao、Tao Miao、Pinhua Li、Lei Wang
DOI:10.1021/acs.orglett.8b03564
日期:2019.1.4
A novel and efficient strategy for the directsynthesis of benzo[f]indazoles via copper-catalyzed cascade reaction of sulfonyl hydrazides with 1,3-enynes under mild conditions has been developed. This method achieves the formation of two C–N bonds and one C–C bond in one pot, providing a series of benzo[f]indazoles in moderate to good yields with good functional group tolerance and remarkable regioselectivity
提出了一种在温和条件下通过磺酰肼与1,3-烯炔的铜催化级联反应直接合成苯并[ f ]吲唑的新颖有效策略。此方法可在一锅中形成两个C–N键和一个C–C键,从而以中等至良好的收率提供了一系列苯并[ f ]吲唑,并具有良好的官能团耐受性和显着的区域选择性。
TBN-mediated regio- and stereoselective sulfonylation & oximation (oximosulfonylation) of alkynes with sulfonyl hydrazines in EtOH/H<sub>2</sub>O
作者:Bin Wang、Zicong Yan、Liyan Liu、Jiawei Wang、Zhenggen Zha、Zhiyong Wang
DOI:10.1039/c8gc02708k
日期:——
A difunctionalization of alkynes cascade reaction was developed to generate α-sulfonylethanone oximes in environmentally benign EtOH/H2O.
Copper-catalyzed arylsulfonylation of N-arylsulfonyl-acrylamides with arylsulfonohydrazides: synthesis of sulfonated oxindoles
作者:Qingshan Tian、Ping He、Chunxiang Kuang
DOI:10.1039/c4ob01231c
日期:——
A copper-catalyzed arylsulfonylation of N-arylsulfonyl-acrylamides with sulfonylhydrazides through a tandem radical process was developed. This methodology provided an alternative strategy for the synthesis of sulfonated oxindoles by forming C–S, C–N and C–C bonds in a single operation.
Visible-Light Photoredox-Catalyzed Regioselective Sulfonylation of Alkenes Assisted by Oximes via [1,5]-H Migration
作者:Shichao Yang、Lei Wang、Lulu Wang、Hongji Li
DOI:10.1021/acs.joc.9b02646
日期:2020.1.17
We herein report a visible-light photoredox-catalyzed regioselective sulfonylation of alkenes with sulfonyl hydrazides assisted by oximes at room temperature, which affords a variety of sulfones in good yields. The initial mechanistic experiments demonstrate that the hydroxyl group within oximes plays a crucial role in this sulfonylation.