Hydrochloric Acid → 1-(1-Dimethylamino-2-propyl)-2-(4-bromophenyl)-1,4,6,7-tetrahydrothiopyrano[4,3-b]pyrrole hydrochloride

Participants

Reaction Conditions

Reaction Steps

A solution of 5.5 g (0.017 mole) of 3-(4-bromophenacyl)-2,3,5,6-tetrahydrothiopyran-4-one [Example 2 (a)], 1.6 g of 2-amino-1-dimethylaminopropane, 16 ml. of ethanol, and one drop of concentrated hydrochloric acid is heated under reflux for 3 hours, cooled to 5°C, and filtered to provide a solid product. The resulting product is dissolved in ethanol, the solution is acidified with ethereal hydrogen chloride and diluted to the cloud point with ether. Upon standing, a solid separates. Recrystallization from ethanol gives off-white crystals of 1-(1-dimethylamino-2-propyl)-2-(4-bromophenyl)-1,4,6,7-tetrahydrothiopyrano[4,3-b]pyrrole hydrochloride, m.p. 237° to 238°C. dec.

Provenance & Evidence