C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/273, 260/309
C07D 277/64 (2006.01) C07D 513/04 (2006.01)
Patent
CA 1336193
A process for the preparation of a compound of the formula Image 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 trifluoro- methylthio, 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 Image 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.
577516
Mylari Banavara Lakshmana
Zembrowski William James
Gowling Lafleur Henderson Llp
Pfizer Inc.
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