Potassium Carbonate → 7-Glycidoxycoumarin

Participants

Reaction Steps

Five grams of 7-(2,3-epoxypropoxy)cumarin obtained by the reaction of 7-hydroxycumarin with epibromohydrin in methyl ethyl ketone in the presence of anhydrous potassium carbonate is heated at reflux for seven hours with 3.1 g of N-carbamoylpiperazine in 100 ml of methanol. After the reaction, methanol is evaporated therefrom in vacuo and the residual crystals are washed with ethyl acetate to give 7.9 g of the product. Hydrochloride recrystallized from a mixture of ethanol and dimethyl formamide melts at 198°-200° C.

Provenance & Evidence