1.亲核加成 Nucleophilic addition HCN 1,4- NH 1,4- C=C-C=0 1)R2CuLi 2)H20 产1,4- 1)RMgX,CuCl 2)H30 1,4- 1)RLi 2)H20 1,2 1)RMgX (1,2- 2)H20 (1,2- (1,4-1. 亲核加成 Nucleophilic addition C=C-C=O HCN 1,4- NH 1,4- 1) R2CuLi 2)H2O 1,4- 1) RMgX,CuCl 2)H3O + 1,4- 1) RLi 2) H2O 1,2- 1) RMgX 2)H2O (1,2- ) (1,2- ) (1,4- )