O-Cresol → Ethyl (4-mercapto-2-methylphenoxy)acetate

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As an alternative synthesis method of GW501516, it is disclosed, as illustrated in the following scheme (2), that the compound (13) of GW501516 can be prepared by introducing ethyl acetate group to o-cresol (14), reacting the resulted compound (15) with sulfonyl chloride, reducing the resulted compound (16) with tin (Sn) under acidic condition to form ethyl (4-mercapto-2-methyl phenoxy)acetate (17), reacting it with 5-chloromethyl-4-methyl-2-(4-trifluoromethyl phenyl)thiazole (11) together with an excessive cesium carbonate to obtain the ethyl ester intermediate (18) of GW501516, and deprotecting the ester group of the intermediate compound with 1N lithium hydroxide.

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