Methyl 3-(triphenylphosphoranylideneamino)pyrazine-2-carboxylate: synthesis, crystal structure and use in pteridin-4(3H)ones synthesis
作者:Tomohiro Okawa、Shoji Eguchi、Akikazu Kakehi
DOI:10.1039/p19960000247
日期:——
The title iminophosphorane 6 has been prepared from methyl 3-aminopyrazine-2-carboxylate 1 by a modified Kirsanov method using a triphenylphosphine–hexachloroethane–triethylamine system. The crystal structure of 6 illustrated an iminophosphorane function (NP bond). 2,3-Disubstituted pteridin-4(3H)-ones were obtained in a one-pot reaction of 6 with isocyanates, followed by heterocyclization on addition of alcohols or amines.
标题中的亚氨基磷烷 6 是用三苯基膦-六氯乙烷-三乙胺体系,通过改进的基尔萨诺夫法,从 3- 氨基吡嗪-2-羧酸甲酯 1 中制备出来的。6 的晶体结构显示了亚氨基磷烷功能(NP 键)。在 6 与异氰酸酯的一锅反应中得到了 2,3-二取代的蝶啶-4(3H)-酮,然后在加入醇或胺后发生杂环化反应。