Arylative annulation of 2-carbonyl-3-propargyl indoles with boronic acids under sequential palladium/triflic acid catalysis is described. The present strategy to provide di-and triaryl carbazoles in one pot involves benzannulation through difunctionalization of alkynes. The strategy showed a good substrate scope with respect to boronic acids as well as 2-carbonyl-3-propargyl indoles to afford the corresponding carbazoles in decent yields.
One-pot synthesis of diversely substituted β-carbolines starting from propargylic alcohols and indole 2-carbonyls is described. Computational and photophysical studies of the products have also been studied.
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