Triphosgene → 3-[1-(3,5-Dimethyl-1h-pyrrol-2-yl)-meth-(z)-ylidene]-2-oxo-2,3-dihydro-indole-1-carbonyl chloride

関与物質

反応手順

To the solution of triphosgene (7.2 gram, 24.2 mmol) in 500 mL of anhydrous THF was added 56 mL of thiethylamine in one portion and the resulting mixture was stirred at room temperature for 10 minutes. Solid 3-[1-(3,5-dimethyl-1H-pyrrol-2-yl)-meth-(Z)-ylidene]-2-oxo-2,3-dihydro-indole (5.768 gram, 24.2 mmol) was added in one portion to the above mixture. The reaction mixture was stirred at room temperature for 1 h and then cooled on ice bath to 0-4° C. Ice-cold 4M HCl aq. (1.5 L) was added in one portion upon vigorous stirring. The resulting suspension was further stirred for 10 min., and filtered. The solid was washed with ice-cold 4M HCl aq. and dried on the high vacuum oven overnight. The crude product was recrystallized from anhydrous benzene and filtered. The solid was then washed with cyclohexane and dried in a vacuum oven overnight to yield 3-[1-(3,5-dimethyl-1H-pyrrol-2-yl)-meth-(Z)-ylidene]-2-oxo-2,3-dihydro-indole-1-carbonyl chloride (5.531 gram, 76%). 1HNMR (400 MHz, DMSO-d6) δ 12.41 (s, br, 1H), 7.98 (m, 1H), 7.52 (m, 1H), 7.43 (s, 1H), 7.25 (m, 1H), 6.08 (d, br, J=2 Hz, 1H), 2.43 (s, 3H), 2.36 (s, 3H).

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