Add time:07/17/2019         Source:sciencedirect.com

Convenient and efficient syntheses of ethyl 4-(3-hydroxy-4-methoxyphenyl)-6,7-dimethoxy-2-(1,2,4-triazol-1-ylmethyl)quinoline-3-carboxylate (1d) and 10-(3,4-dimethoxyphenyl)-7,8-dimethoxy-2H-pyridazino[4,5-b]quinolin-1-one (1e), metabolites of TAK-603 (1), have been achieved. Use of the methanesulfonyl as a protective group of the phenolic hydroxy for Friedel–Crafts reaction enabled a new simpler synthetic route of 1d in high yield. Chloromethyl derivative (23) was converted to formyl derivative (32) using the Kröhnke reaction, followed by cyclization with hydrazine, which formed a novel compound 1e.

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