Regio-controlled iodoaminocyclization reaction of an ambident nucleophile mediated by LiAl(Ot-Bu)4
作者:Osamu Kitagawa、Masao Fujita、Hua Li、Takeo Taguchi
DOI:10.1016/s0040-4039(96)02405-7
日期:1997.1
A new and general method of iodine-mediated cyclization reactions of unsaturated carbamates, ureas and amides which gives N-cyclized products as a single regio-isomer was achieved. The present reaction proceeds in good yield through regio-control of an ambident nucleophile by LiAl(Ot-Bu)4, and the regio-control (N-attack vs O-attack) was also found to be remarkably affected by the additive employed
实现了一种新的,通用的碘介导的不饱和氨基甲酸酯,脲和酰胺环化反应的新方法,该方法可将N环化产物作为一个单一的区域异构体。通过LiAl(O t- Bu)4对环境亲核试剂的区域控制,本反应以良好的收率进行,并且还发现区域控制(N-攻击对O-攻击)受到所用添加剂的显着影响。 。