Chloroform → 5-Amino-2-(4-chloro-2-methoxyphenyl)-4-methylthiazole

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Reaction Steps

In methanol (25 ml), [2-(4-chloro-2-methoxyphenyl)-4-methylthiazol-5-yl]carbamic acid tert-butyl ester (1.02 g, 2.87 mmol) prepared in the Step 28-1-1 was dissolved, and a 4-N hydrogen chloride-dioxane solution (25 ml) was added thereto. The mixture was stirred at a room temperature for 16 hours. Chloroform was added to the mixture, and the resulting mixture was neutralized with a saturated sodium bicarbonate solution. The resulting mixture was subjected to extraction with chloroform. The extract was dried over anhydrous magnesium sulfate and then concentrated. The concentrate was purified by silica gel column chromatography (chloroform:methanol=20:1) to give the title compound (474 mg, 65%) as a light-brown powder.

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