| 摘要 |
A process for the preparation of a compound of the formula <IMG> I 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 <IMG> II wherein A is as defined above or a hydrohalide salt thereof. Halomethyl thiazoles are useful intermediates in the preparation of heterocyclic oxophthalazinyl acetic acids having aldose reductase inhibitory activity. Such compounds are disclosed in European Patent Application Publication Number 0222576. Halomethyl thiazoles are referred to in United States Patents 4,075,207, 4,554,355 and 4,550,172.
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