Process and intermediates for the preparation of...

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C - Chemistry, Metallurgy

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C07D 417/06 (2006.01) A61K 31/425 (2006.01) A61K 31/50 (2006.01) C07D 231/56 (2006.01) C07D 237/32 (2006.01) C07D 471/04 (2006.01) C07D 487/04 (2006.01) C07D 513/04 (2006.01) C07D 519/00 (2006.01)

Patent

CA 2016504

Oxophthalazinyl acetic acids having benzothiazole side chains are prepared by reacting an oxophthalazinyl thioacetamide acetate with hydrogen sulfide and a nitrophenyl compound having a reactive group such that the benzothiazole side chain may be formed by ring closure involving the thioacetamide group. The oxophthalazinyl thioacetamide may be prepared by reacting the corresponding cyanomethyloxophthalazinyl acetate with hydrogen sulfide in the presence of tertiary amines. Analogous indazole and oxopyridopyridazinone acetic acids may be prepared similarly, as well as oxophthalazinyl, indazole and oxopyridopyridazinone acetic acids having thiazolopyridinyl side chains.

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