A process for the preparation of a compound of the formula
wherein R¹ is hydrogen or (C₁-C₄)alkyl, X is chloro or bromo and A represents a 6 membered carbocylic aromatic or a 5 or 6 membered heterocyclic ring which is optionally substituted by one of iodo or trifluoromethylthio, or one or two of fluoro, chloro, bromo, (C₁-C₄)alkyl, (C₁-C₄)alkoxy, (C₁-C₄)alkylthio, (C₁-C₄)alkylsulfinyl, (C₁-C₄)alkylsulfonyl, or trifluoromethyl, comprising reacting haloacetonitrile with a compound of the formula wherein A is as defined above or a hydrohalide salt thereof.The compounds of the formula (I) are useful intermediates in the preparation of heterocyclic oxophthalazinyl acetic acids having aldose reductase inhibitory activity. Some of the compounds of the formula (I) are novel, and these also form a part of the invention.
一种制备式中R¹为氢或(C₁-C₄)烷基,X为
氯或
溴,A代表一个6元环芳香族或一个5或6元杂环,其可以被
碘或三
氟甲基
硫氧基取代,或者可以被一到两个
氟、
氯、
溴、(C₁-C₄)烷基、(C₁-C₄)烷氧基、(C₁-C₄)烷基
硫氧基、(C₁-C₄)烷基磺酰基、(C₁-C₄)烷基磺酰基或三
氟甲基取代的化合物的制备方法,包括将卤代
乙腈与式中A为上述定义或其氢卤化物盐的化合物反应。式(I)化合物是制备具有醛糖还原酶抑制活性的杂环氧
酞啉基
乙酸的有用中间体。其中一些式(I)化合物是新颖的,也构成了本发明的一部分。