4-Chlorobutyryl chloride → 7-(4-chlorobutyryl)-2,3-dihydrothieno[3,2-f][1,4]thiazepin-5(4H)-one

Participants

Reaction Steps

To a mixture of 13 g of 2,3-dihydrothieno[3,2-f][1,4]thiazepin-5(4H)-one and 21.5 g of 4-chlorobutyryl chloride in 200 ml of dichloroethane was added 21.5 g of aluminum chloride under cooling and the mixture was stirred for 3 hours. The mixture was poured into ice-cold water and extracted with chloroform. The organic layer was washed with saline solution, dried over magnesium sulfate and concentrated. The residue was recrystallized from ethanol to give 12 g of 7-(4-chlorobutyryl)-2,3-dihydrothieno[3,2-f][1,4]thiazepin-5(4H)-one as white crystals, m.p. 124°-125° C.

Provenance & Evidence