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
N-氨基甲酰基-4-吡啶酮与有机铜酸酯和有机锌酸酯进行共轭加成反应,得到2-取代的2,3-二氢-4-吡啶酮,为取代的哌啶和哌啶酮提供了直接的合成方法。用铜催化的二烷基铜酸锂,烷基氰基铜酸盐,RLi / CuCN(0.3当量)和三烷基锌酸盐可实现良好至优异的共轭加合物收率。在格氏试剂的共轭加成中的铜催化提供适量的共轭加合物。富含对映体的亚磷酰胺配体以91.5:8.5的er促进铜催化的Et 2 Zn与N-氨基甲酰基-4-吡啶酮的共轭加成。