Pyridine → N-[[[4-[2-chloro-4-(trifluoromethyl)phenoxy]-2-fluorophenyl]amino]thio]-L-proline, methyl ester

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Reaction Steps

A solution of sulphur dichloride (11.3 g) in dichloromethane (20 ml) was added at room temperature over 15 minutes to a stirred solution of L-proline, methyl ester hydrochloride (16.6 g) in the same solvent (50 ml), following which a solution of pyridine (17.4 g) in the same solvent (20 ml) was added to the reaction mixture over 30 minutes. After stirring overnight, the mixture was diluted with diethyl ether (150 ml), filtered, and stripped of solvent to leave 17.8 g of the crude product. 4.3 g of this product was dissolved in diethyl ether (10 ml) and added over 15 minutes at room temperature to a stirred mixture of the compound of Example 1 (6.1 g), triethylamine (2.2 g) and diethyl ether (50 ml). After stirring at room temperature for 30 minutes, 250 mls of diethyl ether were added, the mixture was washed with water, dried and stripped of solvent. After chromatography over silica using a mixture of diethyl ether and petroleum ether as eluant, 6.9 g of the desired crude product was obtained in the form of a brown oil.

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