Novel phthalidylammonium compounds (IV) are intermediates in a highly selective and high yield process for producing 1-phthalidyl-5-fluorouracil derivatives of formula (I) which are antitumour agents. The process comprises reacting a phthalidyl compound (II) with an amine (III) to yield the quaternary ammonium salts (IV), and then reacting the latter with 5-fluorouracil as follows:
in which X is a leaving group; R1, R2 and R3 each independently represents alkyl or R' represents alkyl and R2 and R3 taken together with the adjacent nitrogen atom form a saturated 5- or 6-membered ring which may contain oxygen or
represents quinuclidine; and R4 and R5 each independently represents hydrogen, trialkylsilyloxy, alkoxy, nitro, cyano, carboxy or alkoxycarbonyl.
新型
酞铵化合物(IV)是一种高选择性和高产率工艺的中间体,可用于生产抗肿瘤剂式(I)的 1-
酞酰基-5-
氟尿
嘧啶衍
生物。该工艺包括将
邻苯二甲酰基化合物(II)与胺(III)反应生成季
铵盐(IV),然后将后者与 5-
氟尿
嘧啶反应如下:
其中 X 是离去基团;R1、R2 和 R3 各自独立地代表烷基或 R' 代表烷基,R2 和 R3 与相邻的氮原子一起形成饱和的 5 或 6 元环,该环可能含有氧或
代表
奎宁环;以及 R4 和 R5 各自独立地代表氢、三烷基
硅氧基、烷氧基、硝基、
氰基、羧基或烷氧羰基。