Nucleophile-Controlled Trapping of Gold Carbene by Nitriles and Water: Synthesis of 5H-Pyrimido[5,4-b]indoles and 2-Benzylidene-3-indolinones

作者：Zhu, Yun-Long; Dong, Yi-Fan; Wang, Si-Ru; Li, You-Gui^*; Wu, Xiang^*; Ye, Long-Wu

来源：Organic Letters, 2024, 26(3): 631-635.

DOI：10.1021/acs.orglett.3c03856

• GENERATED IN-SITU
• ONE-POT SYNTHESIS
• 2-ALKYNYL ARYLAZIDES
• EFFICIENT ACCESS
• CYCLOADDITION
• ANNULATION
• OXAZOLES
• ALKYNES

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 beta- sulfonamido-alpha-imino gold carbene is the key intermediate which is generated through the gold-catalyzed cyclization of N-(2azidophenyl-ynyl)methanesulfonamides and undergoes formal [4 + 2] cascade annulation with nitriles and intramolecular S(N)2 ' type reaction with water, respectively.

• 单位
  厦门大学