Thiophosgene → 2-Tert-butyl-6-isocyanato-5-[4-methyl-piperazin-1-yl]benzothiazole

Participants

Reaction Steps

To a stirred mixture of 75 g of 6-amino-2-tert-butyl-5-(4-methylpiperazin-1-yl)benzothiazole and 29 g of sodium bicarbonate in 1100 ml of chloroform at 0° is added 41 g of thiophosgene and the mixture stirred at 10° for 4 hours. After filtering off the solid, the solution is evaporated to get an yellow solid which is dissolved in water and the pH of the solution is brought to 7 by the addition of dilute sodium hydroxide. The solid separated is extracted with hexane and filtered through 150 g of neutral alumina to give 2-tert-butyl-6-isocyanato-5-[4-methyl-piperazin-1-yl]benzothiazole melting at 124°-126°.

Provenance & Evidence