A method for five- and six-membered heterocycle formation by palladium-catalyzed C-H/N-H coupling is presented. The method employs a picolinamide directing group, PhI(OAc)(2) oxidant, and toluene solvent at 80-120 degrees C. Cyclization is effective for sp(2) as well as aliphatic and benzylic sp(3) C-H bonds.
Expeditious synthesis of phenanthridines through a Pd/MnO<sub>2</sub>-mediated C–H arylation/oxidative annulation cascade from aldehydes, aryl iodides and amino acids
作者:Jian Fan、Li Li、Jitan Zhang、Meihua Xie
DOI:10.1039/d0cc00300j
日期:——
The expeditious construction of phenanthridine scaffolds via a Pd/MnO2-mediated C-H arylation/oxidative annulationcascade involving aldehydes, aryl iodides and amino acids is disclosed. This reaction proceeds smoothly involving the formation of multiple chemical bonds with the tolerance of a wide range of functional groups. The control experiments suggest a radical mechanism for C-N bond formation