Synthesis of 2H-Indazoles via Tandem Palladium-Catalyzed Deacylative Cross-Coupling and Denitrogenative Cyclization of 2-Iodoazoarenes and 2-Iodoaryltriazenes with Acyldiazoacetates in One-Pot

초록

A synthetic method to prepare a wide range of 2H-indazoles was developed via a tandem palladium-catalyzed deacylative cross-coupling reaction of 2-iodoazoarenes and 2-iodoaryltriazenes with acyldiazoacetates and denitrogenative cyclization reaction of in situ generated diazoacetates having azoaryl and triazenylaryl moieties in one-pot. Additionally, azoaryl-substituted diazoacetates underwent palladium-catalyzed denitrogenative cyclization to produce 2H-indazoles. The present reaction is a good example in which a Pd(0)-catalyst is involved in two catalytic cycles in one-pot.

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