Lawesson's reagent → HCID 19020428, compound

Participants

Reaction Steps

(aae) 19.6 g of 2.3-dihydro-4H-thieno[2,3-e][1,3]-thiazin-4-one were heated under reflux together with 23.1 g of Lawesson reagent in 200 ml of acetonitrile until all of the starting material reacted. The reaction mixture was cooled and the crystallized-out product was removed by filtration. By recystallization from ethyl acetate there was obtained pure 2,3-dihydro-4H-thieno[2,3-e][1,3]thiazine-4-thione of m.p. 136°-138°. Additional material can be obtained by evaporation of the mother liquor and recrystallization.

Provenance & Evidence