Synthesis of indolo [1,2-a]quinoxalines via a Pd-catalyzed regioselective C-H olefination/cyclization sequence.

A highly efficient approach to indolo [1,2-a]quinoxaline derivatives through a Pd-catalyzed regioselective C-H olefination/cyclization sequence has been developed. This transformation has a wide range of substrates with various functional groups, and the corresponding heterocyclic products were obtained in good yields.
(© 2012 American Chemical Society)