The invention relates to substituted phenylbarbituric acids of the formula ##STR1## wherein R.sup.1 and R.sup.3, independently, are lower-alkoxy or lower-alkylthio; R.sup.2 is lower-alkoxy, hydroxy or amino; and R.sup.4 is hydrogen; or R.sup.1 and R.sup.2 are lower-alkoxy, R.sup.3 is hydrogen and R.sup.4 is lower-alkyl, which are prepared from correspondingly substituted benzene derivatives and alloxan. The compounds of formula I can be converted into substituted benzaldehydes which in turn are known intermediates in the preparation of pharmaceutically valuable benzylpyrimidines.
本发明涉及公式##STR1##中的取代苯基
巴比妥酸,其中R.sup.1和R.sup.3独立地是低烷氧基或低烷
硫基;R.sup.2是低烷氧基,羟基或
氨基;R.sup.4是氢;或者R.sup.1和R.sup.2是低烷氧基,R.sup.3是氢,R.sup.4是低烷基,这些化合物是从相应的取代苯衍
生物和
尿囊素制备而成的。公式I的化合物可以转化为取代
苯甲醛,而后者又是制备具有药用价值的苄基
嘧啶的已知中间体。