Nucleophilic Addition of Benzimidazoles to Alkynyl Bromides/Palladium-Catalyzed Intramolecular C–H Vinylation: Synthesis of Benzo[4,5]imidazo[2,1-a]isoquinolines
摘要:
An efficient "one-pot" route for the synthesis of benzo[4,5]imidazo[2,1-a] isoquinolines has been developed via nucleophilic addition of 2-aryl benzimidazoles to alkynyl bromides and subsequent palladium-catalyzed intramolecular C-H vinylation.
One-pot concise syntheses of benzimidazo[2,1-a]isoquinolines by a microwave-accelerated tandem process
作者:Noriko Okamoto、Keisuke Sakurai、Minoru Ishikura、Kei Takeda、Reiko Yanada
DOI:10.1016/j.tetlet.2009.04.126
日期:2009.7
Direct, efficient syntheses of the benzimidazo[2,1-a]isoquinolineringsystem have been achieved with 2-bromoarylaldehydes, terminal alkynes, and 1,2-phenylenediamines by a microwave-accelerated tandem process in which a Sonogashira coupling, 5-endo cyclization, oxidative aromatization, and 6-endo cyclization can be performed in a single synthetic operation.
Nucleophilic Addition of Benzimidazoles to Alkynyl Bromides/Palladium-Catalyzed Intramolecular C–H Vinylation: Synthesis of Benzo[4,5]imidazo[2,1-<i>a</i>]isoquinolines
作者:Jinsong Peng、Guoning Shang、Chunxia Chen、Zhongshuo Miao、Bin Li
DOI:10.1021/jo302471z
日期:2013.2.1
An efficient "one-pot" route for the synthesis of benzo[4,5]imidazo[2,1-a] isoquinolines has been developed via nucleophilic addition of 2-aryl benzimidazoles to alkynyl bromides and subsequent palladium-catalyzed intramolecular C-H vinylation.