Water → HCID 18539369, compound

Participants

Reaction Steps

14.73 ml of triflic anhydride is added, under inert gas and at 0° C., to 19.0 g of 3,5-dibromo-4-hydroxy-benzaldehyde in 100 ml of pyridine. Agitation is carried out for 1 hour while allowing the temperature to return to ambient, the reaction medium is poured into water and the aqueous phase is extracted with 3 times 150 ml of dichloromethane. The organic phases are dried and evaporated to dryness under reduced pressure. 23.83 g of crude product is obtained which is purified by filtration chromatography using a cyclohexane/ethyl acetate mixture 1/1 as eluant. In this way 23.83 g of expected product is obtained. Rf: 0.71, cyclohexane/ethyl acetate 1/1. The operation is carried out in an equivalent manner for the preparation of the following triflates of general formula II

Provenance & Evidence