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.
一种制备式化合物的工艺
其中 R¹ 是氢或(C₁-C₄)烷基,X 是
氯或
溴,A 代表 6 个成员的碳环芳香族或 5 或 6 个成员的杂环,该环任选被
碘或三
氟甲
硫基或
氟、
氯、
溴、(C₁-C₄)烷基、(C₁-C₄)烷基、(C₁-C₄)烷基中的一个或两个取代、
溴、(C₁-C₄)烷基、(C₁-C₄)烷氧基、(C₁-C₄)烷
硫基、(C₁-C₄)烷基亚磺酰基、(C₁-C₄)烷基磺酰基或三
氟甲基中的一种或两种、包括卤代
乙腈与式中 A 如上定义的化合物或其氢卤化物盐反应。
式(I)化合物是制备具有醛糖还原酶抑制活性的杂环氧
酞嗪基
乙酸的有用中间体。一些式(I)化合物是新型的,它们也构成了本发明的一部分。