Nucleophile-Controlled Trapping of Gold Carbene by Nitriles and Water: Synthesis of 5<i>H</i>-Pyrimido[5,4-<i>b</i>]indoles and 2-Benzylidene-3-indolinones
作者:Yun-Long Zhu、Yi-Fan Dong、Si-Ru Wang、You-Gui Li、Xiang Wu、Long-Wu Ye
DOI:10.1021/acs.orglett.3c03856
日期:2024.1.26
A gold-catalyzed, nucleophile-controlled cascade reaction of N-(2-azidophenyl-ynyl)methanesulfonamides with nitriles and water is described that provides structurally diverse 5H-pyrimido[5,4-b]indoles and 2-benzylidene-3-indolinones in good to excellent yields. Mechanistic studies indicate that the β-sulfonamido-α-imino gold carbene is the key intermediate which is generated through the gold-catalyzed
描述了N- (2-叠氮苯基-炔基)甲磺酰胺与腈和水的金催化亲核试剂控制级联反应,提供结构多样的 5 H-嘧啶基[5,4 -b ]吲哚和 2-亚苄基-3-二氢吲哚酮的收率良好至极好。机理研究表明,β-磺酰胺基-α-亚氨基金卡宾是金催化N- (2-叠氮苯基-炔基)甲磺酰胺环化生成的关键中间体,并与腈进行正式的[4 + 2]级联成环反应分别与水发生分子内S N 2′型反应。