Synthesis of dihydrophenanthridines by a sequence of Ugi-4CR and palladium- catalyzed intramolecular C-H functionalization

• Florence Bonnaterre,
• Michèle Bois-Choussy and
• Jieping Zhu

Beilstein J. Org. Chem. 2008, 4, No. 10, doi:10.3762/bjoc.4.10

• reaction pathway leading to the formation of oxindole via an intramolecular N-arylation process was not observed under these conditions [25][26][27]. The preferential formation of compound 1a indicated that cyclization via palladium-catalyzed CH functionalization could be, under appropriate conditions, a