Hydrochloric Acid → HCID 18932285, compound

Participants

Reaction Steps

15 ml of concentrated hydrochloric acid were carefully added to 4.99 g of O-(benzothiazol-2-ylmethyl)-4-nitrophenol [prepared as described in step (a) above] suspended in 100 ml of ethanol, with ice cooling, after which 8.26 g of stannous chloride were added in small portions to the resulting mixture at the same temperature. The temperature of the reaction mixture was then elevated to room temperature and the mixture stirred for 30 minutes at this temperature, before elevating the temperature further to 50° C. and stirring at this new temperature for a further 1.5 hours. At the end of this time 15 ml of concentrated hydrochloric acid and 8.26 g of stannous chloride were added to the reaction mixture and the resulting mixture was then stirred at 50° C. for 4 hours. The reaction mixture was then allowed to cool to room temperature, after which a saturated aqueous sodium hydroxide solution was added to the reaction mixture to adjust it to pH 10 and the resulting mixture was extracted with ethyl acetate. The resulting extract was washed with water, dried over anhydrous sodium sulfate and the solvent was removed by evaporation under reduced pressure to give a crude crystalline solid which was washed with a 10:1 by volume mixture of hexane and ethyl acetate to give 1.92 g (yield 43%) of the title compound as a solid having a melting point of 87° to 90° C.

Provenance & Evidence