Hydrochloric Acid → 3-[1-({6-Amino-3,5-dicyano-4-[4-(2-methoxyethoxy)phenyl]pyridin-2-yl}sulfanyl)ethyl]-benzenecarboxylic acid

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150 mg (0.307 mmol) of methyl 3-[1-({6-amino-3,5-dicyano-4-[4-(2-methoxyethoxy)phenyl]-pyridin-2-yl}sulfanyl)ethyl]benzenecarboxylate (Example 65A) were dissolved in 7 ml of tetrahydrofuran. After addition of 14.7 mg (0.61 mmol) of lithium hydroxide, the mixture was stirred at RT overnight. The mixture was then stirred at 40° C. for 4 h. Using 1N hydrochloric acid, the pH of the reaction solution was adjusted to pH 4, and the clear solution was purified by preparative HPLC (Chromasil, water/acetonitrile+0.1% trifluoroacetic acid).

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