New uracil derivatives of the general formula: ##STR1## wherein R.sup.1 stands for a hydrogen atom or a grouping of the formula: ##STR2## R.sup.2 for a hydrogen atom, an alkyl group or a phenyl group and R.sup.3 for an alkyl group or a phenyl group, with the proviso that when both R.sup.1 and R.sup.2 stand for a hydrogen atom, R.sup.3 stands for a phenyl group or a straight chain alkyl group with 3.about.11 carbon atoms, that when R.sup.1 stands for a hydrogen atom and R.sup.2 for methyl group, R.sup.3 stands for an alkyl group with at least 2 carbon atoms or a phenyl group, and that when R.sup.1 stands for a hydrogen atom and R.sup.3 for methyl group, R.sup.2 stands for an alkyl group with at least 2 carbon atoms or a phenyl group. These uracil derivatives are prepared by reacting 5-fluorouracil with an .alpha.-haloalkyl carboxylate or with an aldehyde diacylate or by hydrolyzing a 1,3-bis(acyloxymethyl)-5-fluorouracil with an acid or alkali. These uracil derivatives are useful as improved anti-tumor agents especially for oral administration and injection.
新的尿
嘧啶衍
生物的一般式为:##STR1## 其中 R.sup.1 代表氢原子或公式的基团:##STR2## R.sup.2 代表氢原子、烷基或苯基,R.sup.3 代表烷基或苯基,但当 R.sup.1 和 R.sup.2 都代表氢原子时,R.sup.3 代表苯基或具有 3~11 个碳原子的直链烷基;当 R.sup.1 代表氢原子,R.sup.2 代表甲基基团时,R.sup.3 代表至少具有 2 个碳原子的烷基或苯基;当 R.sup.1 代表氢原子,R.sup.3 代表甲基基团时,R.sup.2 代表至少具有 2 个碳原子的烷基或苯基。这些尿
嘧啶衍
生物是通过将 5-
氟尿
嘧啶与α-卤代烷基
羧酸酯或醛二酰酸酯反应或通过酸或碱
水解 1,3-双(酰氧甲基)-5-
氟尿
嘧啶制备的。这些尿
嘧啶衍
生物可用作改进的抗肿瘤剂,特别适用于口服和注射。