Reaction of 2-nitrobenzaldehydes with diethyl (diethoxyphosphinyl)succinate: a new synthesis of quinoline-2,3-dicarboxylic acid esters via their N-oxides
funcitonalized quinolines with the merits of broad substrate scope, good functional group tolerance, excellent hydrogen transfer selectivity, reusable earth-abundant metal catalyst, and operational simplicity. The developed chemistry paves the ways for further design of hydrogen transfer-mediated coupling reactions by developing heterogeneous catalysts with suitable supports.