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新型式,其化学式为##STR1##其中R.sup.1和R.sup.2分别为(C.sub.1 -C.sub.4)烷基或一起为(C.sub.2 -C.sub.4)亚烷基,以及它们在制备化合物的过程中的用途,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为苯或被Cl、Br、F、CH.sub.3或OCH.sub.3单取代的苯,n为2到4;包括在惰性反应溶剂和碱的存在下,将其中一种中间体与公式为##STR3##的酰胺基反应,以及一种制备进一步中间体1,2-二氯-1-丁烯-3-酮的方法。