Boron tribromide → 5-Formyl-2,3-dihydroxybenzonitrile

참여 물질

반응 조건

반응 단계

18 g of the product of Step A and 400 ml of dichloromethane were mixed together under nitrogen and the mixture was cooled to 0° C. 150 ml of a molar solution of boron tribromide in dichloromethane were added and the mixture stood for one night at ambient temperature. It was concentrated, cooled again to 0° C. and 250 ml of a normal solution of hydrochloric acid were added. The crystallized product was separated out, washed with water, dried then crystallized from an isopropanol—water mixture (1-2) to obtain 12 g of the expected product.

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