申请人:Pfizer Inc.
公开号:US04482723A1
公开(公告)日:1984-11-13
Novel intermediates of the formula ##STR1## where R.sup.1 and R.sup.2 are each (C.sub.1 -C.sub.4)alkyl or taken together are (C.sub.2 -C.sub.4)alkylene, and their use in a process for preparation of compounds of the formula ##STR2## where R is (C.sub.1 -C.sub.6)alkyl or (CH.sub.2).sub.n Ar, Ar is phenyl or phenyl monosubstituted by Cl, Br, F, CH.sub.3 or OCH.sub.3 and n is 2 to 4; which comprises contacting one of said intermediates with an amidine of formula ##STR3## in the presence of reaction inert solvent and base; and a process for preparing a further intermediate, 1,2-dichloro-1-buten-3-one.
该专利描述了一种中间体的化合物,其化学式为##STR1## 其中R.sup.1和R.sup.2分别为(C.sub.1-C.sub.4)烷基或取在一起为(C.sub.2-C.sub.4)烷基,以及它们在制备化合物的过程中的应用,该化合物的化学式为##STR2## 其中R为(C.sub.1-C.sub.6)烷基或(CH.sub.2).sub.n Ar,Ar为苯基或经Cl,Br,F,CH.sub.3或OCH.sub.3单取代的苯基,n为2至4;包括在反应惰性溶剂和碱的存在下,将其中一种中间体与公式为##STR3## 的胺基嘧啶接触的方法;以及制备进一步中间体1,2-二氯-1-丁烯-3-酮的方法。