Palladium Catalyzed Carbonylative Cross-Coupling Reaction of Indolylborates with Prop-2-ynyl Carbonates

Palladium catalyzed carbonylative cross-coupling reaction of 1-methylindolylborate (2a) with prop-2-ynyl carbonates (3) produced cyclopenta- [b]indole derivatives in a one-pot manner.Hence, the use of indolylborates (2c, d) for the reaction with 3 allowed the isolation of indol-2-yl allenyl ketones (4).