申请人:PFIZER INC.
公开号:EP0125777A1
公开(公告)日:1984-11-21
Novel intermediates of the formula
where R' and R2 are each (C1-C4) alkyl ortaken together are (C2-C4) alkylene, and their use in a process for preparation of compounds of the formula
where R is (C1-C6) alkyl or (CH2)nAr, Ar is phenyl or phenyl monosubstituted by Cl, Br, F, Ch3 or OCH3 and n is 2 to 4; which comprises contacting one of said intermediates with an amidine of formula
in the presence of reaction inert solvent and base; and a process for preparing a further intermediate, 1,2-dichloro-1-buten-3-one.
式中的新型中间体
其中 R' 和 R2 各为 (C1-C4) 烷基或合在一起为 (C2-C4) 亚烷基,以及它们在制备式化合物的工艺中的用途
其中 R 为 (C1-C6) 烷基或 (CH2)nAr,Ar 为苯基或由 Cl、Br、F、Ch3 或 OCH3 单取代的苯基,n 为 2 至 4;该工艺包括将上述中间体之一与式
以及制备另一种中间体 1,2-二氯-1-丁烯-3-酮的工艺。