A General and Mild Palladium-Catalyzed Domino Reaction for the Synthesis of 2<i>H-</i>Indazoles
作者:Nis Halland、Marc Nazaré、Omar R'kyek、Jorge Alonso、Matthias Urmann、Andreas Lindenschmidt
DOI:10.1002/anie.200902323
日期:2009.9.1
Practical and highly versatile, the reaction of readily available (2‐chlorophenyl)acetylene and hydrazine substrates affords substituted 2H‐indazoles in just a few hours under very mild reaction conditions (see scheme; DMF=N,N‐dimethylformamide). The catalyzed domino sequence consists of a regioselective coupling followed by an intramolecular hydroamination and subsequent isomerization of the resulting
实用且用途广泛,易于获得的(2-氯苯基)乙炔和肼底物在非常温和的反应条件下(仅在几小时内)即可在短短几个小时内产生取代的2 H-吲唑(参见方案; DMF = N,N-二甲基甲酰胺)。催化的多米诺序列由区域选择性偶联,随后的分子内加氢胺化和随后的所得环外键的异构化组成。