Intramolecular dehydrogenative cyclization of 2-methoxyiminoacyl-protected phenylalanine derivatives proceeded at 110 °C under catalysis of Pd(OAc)2 in the presence of 1-fluoro-2,4,6-trimethylpyridinium tetrafluoroborate to afford substituted indoline-2-carboxylates that were converted into indoline-2-carboxylate-embodied dipeptides via Raney Ni-catalyzed hydrogenation.
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Assembly of indoline-2-carboxylate-embodied dipeptides via Pd-catalyzed C(sp2)-H bond direct functionalization.
Org Lett
February 2015
College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Dandong Lu West 1, Fushun 113001, China.
Intramolecular dehydrogenative cyclization of 2-methoxyiminoacyl-protected phenylalanine derivatives proceeded at 110 °C under catalysis of Pd(OAc)2 in the presence of 1-fluoro-2,4,6-trimethylpyridinium tetrafluoroborate to afford substituted indoline-2-carboxylates that were converted into indoline-2-carboxylate-embodied dipeptides via Raney Ni-catalyzed hydrogenation.
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