Conjugate Addition Reactions of <i>N</i>-Carbamoyl-4-Pyridones with Organometallic Reagents
作者:R. Karl Dieter、Fenghai Guo
DOI:10.1021/jo900327q
日期:2009.5.15
N-Carbamoyl-4-pyridones undergo conjugate addition reactions with organocuprates and organozincates to afford 2-substituted-2,3-dihydro-4-pyridones providing a direct synthetic approach to substituted piperidines and piperidones. Good to excellent yields of conjugate adducts are achieved with lithium dialkylcuprates, alkylcyanocuprates, RLi/CuCN (0.3 equiv), and trialkylzincates with copper catalysis