申请人:Burroughs Wellcome Co.
公开号:US04144263A1
公开(公告)日:1979-03-13
Benzyl cyanoacetals of formula: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are the same or different and each is a halogen or a hydrogen atom, an alkoxy group, an alkyl group, or a dialkylamino group; R.sup.4 is an alkoxycarbonyl group, or an aldehyde group; And R.sup.5 is an alkyl group; the alkyl or alkoxy groups each having from 1 to 4 carbon atoms, and their use as intermediates in the preparation of antibacterial 2,4-diamino-5-benzylpyrimidines. They are prepared from a reaction between an orthoester and an .alpha.-substituted-.beta.-benzylpropionitrile and then the resulting cyanoacetal is converted to the benzyl-pyrimidine by reaction with guanidine.
苯基氰乙醛的化学式为:##STR1## 其中R.sup.1、R.sup.2和R.sup.3相同或不同,每个都是卤素或氢原子、烷氧基、烷基或二烷基氨基;R.sup.4是烷氧羰基或醛基;而R.sup.5是烷基;烷基或烷氧基中每个有1至4个碳原子,并且它们用作制备抗菌2,4-二氨基-5-苄基嘧啶的中间体。它们是通过对正酯和α-取代-β-苯基丙腈的反应制备的,然后将得到的氰乙醛与胍反应转化为苄基嘧啶。