The reaction of the salts of alkyl dicyanoacetates and N-(dichloromethylene) dialkylammonium chlorides in chloroform leads to 4-chloro-5-cyano-2-dialkylamino-6H -1,3-oxazin-6-ones. The chloro atom of these compounds can be easily substituted in a Michaelis-Arbuzov reaction with trialkyl phosphites, giving dialkyl (5-cyano-2-dialkylamino-6-oxo-6-H-1,3-oxazin-4-yl)phosphonates in good yields.
二
氰基
乙酸烷基酯和 N-(二
氯亚甲基)二烷基
氯化铵的盐类在
氯仿中反应生成 4-
氯-5-
氰基-2-二烷基
氨基-6H-1,3-恶嗪-6-酮。这些化合物的
氯原子可以很容易地与三烷基
亚磷酸发生迈克尔-阿尔布佐夫反应,从而以良好的收率得到二烷基(5-
氰基-2-二烷基
氨基-6-氧代-6-H-1,3-恶嗪-4-基)
膦酸盐。