3-Bromo-3-cyanosuccinimides 1 and 3,5-dibromo-3,5-dicyanoglutarimides 17 react with P(OPh)3, Ph2POPh and PhP(OPh)2 to yield quasiphosphonium salts. The glutarimide adducts were transformed rapidly into 2,6-dibromo-3,5-dicyano-1,4-dihydropyridines 22. 3-Bromo-3-cyano-1-methylsuccinimide and P(OPh3) yields an oxazaphosphorane 6. An equilibrium exists between oxazaphosphoranes and iminophosphoranes for
3-溴-3-
氰基琥珀
酰亚胺1和3,5-二
溴-3,5-二
氰戊二
酰亚胺17与P(OPh)3,Ph 2 POPh和PhP(OPh)2反应,生成准盐。戊二
酰亚胺加合物迅速转化为2,6-二
溴-3,5-二
氰基-1,4-
二氢吡啶22。3-溴-3-
氰基-1-甲基琥珀
酰亚胺和P(OPh 3)产生氧杂
磷烷6。对于由琥珀
酰亚胺与PhP(OPh)2或Ph 2 P(OPh)形成的加合物,氧杂氮杂膦和亚
氨基正膦之间存在平衡。