Diisopropylethylamine → 1-[(5-Chloro-1-phenylsulfonylindol-2-yl)sulfonyl]-4-[5-(2-methylpyridin-4-yl)thiazol-2-yl]piperazine

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Reaction Steps

A saturated solution of hydrochloride in methanol (12 ml) was added to 1-(t-butoxycarbonyl)-4-[5-(2-methylpyridin-4-yl)thiazol-2-yl]piperazine (400 mg) at room temperature. After stirring for 10 minutes, the reaction mixture was concentrated under reduced pressure, whereby 1-[5-(2-methylpyridin-4-yl)thiazol-2-yl]piperazine hydrochloride was obtained as a white solid. In a solution of the resulting hydrochloride in methylene chloride (12 ml) was dissolved 5-chloro-1-phenylsulfonylindol-2-sulfonyl chloride (522 mg), followed by the addition of diisopropylethylamine (538 μl) at room temperature. After stirring for 3 hours, a saturated aqueous solution (50 ml) of sodium bicarbonate was added to the reaction. mixture to separate it into layers. The water layer was extracted with methylene chloride (2×15 ml). The organic layers were combined, dried over anhydrous sodium sulfate and distilled under reduced pressure to remove the solvent. The residue was purified by chromatography on a silica gel column (methylene chloride:acetone=7:1), whereby the title compound (240 mg) was obtained as a foam.

Provenance & Evidence