Potassium Iodide → 1-[2-(1-ethyl-3,4-dihydro-6,7-dimethoxy-1H-2-benzopyran-1-yl)ethyl]-4-(4,4-diphenylbutyl)piperazine (E)-2-butenedioate

Participants

Reaction Conditions

Reaction Steps

A mixture of 8 g of 1-(4,4-diphenylbutyl)piperazine hydrochloride, 8.4 g of known 1-(2-chloroethyl)-1-ethyl-3,4-dihydro-6,7-dimethoxy-1H-2-benzopyran, 5,6 g of potassium carbonate and 1 g of potassium iodide in 100 ml of dimethylformamide was heated at 100° C. for 3 h. After hydrolysis the mixture was extracted twice with ethyl acetate, dried and concentrated. The difumarate salt was prepared by adding 14.6 g of fumaric acid to a solution of the free base in ethanol, to give 4.2 g (35.6%) of 1-[2-(1-ethyl-3,4-dihydro-6,7-dimethoxy-1H-2-benzopyran-1-yl)ethyl]-4-(4,4-diphenylbutyl)piperazine (E)-2-butenedioate (1:2) salt. mp 207.8° C.

Provenance & Evidence