Cascade Coupling/Cyclization Process to N-Substituted 1,3-Dihydrobenzimidazol-2-ones
摘要:
Assembly of N-substituted 1,3-dihydrobenzimidazol-2-ones is achieved starting from methyl o-haloarylcarbamates via a Cul/amino acid catalyzed coupling with amines and subsequent condensative cyclization. A number of functional groups are tolerated by these reaction conditions, including vinyl, nitro, carboxylate, amide, ester, ketone, and silyl ether groups.
N-arylcarbamates under mild conditions for the first time. Although being weakly coordinating, N-arylcarbamates act very well as a removable directing group for activation of C–H bonds. The developed procedure results in extremely valuable halogenated N-arylcarbmates that can further be hydrolyzed to halogenated anilines. The obtained reaction conditions showed broad scope and wide functional group tolerance
Cascade Coupling/Cyclization Process to N-Substituted 1,3-Dihydrobenzimidazol-2-ones
作者:Benli Zou、Qiliang Yuan、Dawei Ma
DOI:10.1021/ol701792j
日期:2007.10.1
Assembly of N-substituted 1,3-dihydrobenzimidazol-2-ones is achieved starting from methyl o-haloarylcarbamates via a Cul/amino acid catalyzed coupling with amines and subsequent condensative cyclization. A number of functional groups are tolerated by these reaction conditions, including vinyl, nitro, carboxylate, amide, ester, ketone, and silyl ether groups.