Thionyl Chloride → HCID 22707763, compound

Participants

Reaction Steps

10.5 g (37.6 mmol) of 3-(2-hydroxyethyl)-6-ethyl-3,4,5,6,7,8-hexahydropyrido[3′,4′:4,5]thieno[2,3-d]pyrimidin-4-one in 100 ml of 1,2-dichloroethane were heated to reflux (slow dissolution), after which 3.5 ml (48 mmol) of thionyl chloride in 20 ml of 1,2-dichloroethane were added dropwise. After 1 h of reflux boiling, the reaction mixture was allowed to cool down and the solid was filtered off with suction; it was then rewashed with 1,2-dichloroethane. The crude product was partitioned between methylene chloride and water at pH=9. After the organic phase had been dried and concentrated, 9.3 g (83%) of product were isolated as a dark oil, which slowly crystallizes throughout and which is sufficiently pure for the subsequent reactions, m.p. 94-96° C.

Provenance & Evidence