Dimethyl Sulfoxide → HCID 178511884, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred mixture of 2,3,4,6,11,11a-hexahydro-1H-pyrazino[1,2-b]isoquinolin-8-amine trihydrochloride (1.8 g, 5.76 mmol) and methyl sulfoxide (20 ml) was added pyridine (0.94 ml) followed by S-methyl-2-thiophenethiocarboximide hydrochloride (2.13 g). The mixture was heated at 50° C., with stirring, for 7 h. The reaction mixture was then poured into water (150 ml) and, after stirring for 1 hour, the mixture was clarified by filtration. The filtrate was basified with 2.5N sodium hydroxide solution but no precipitate formed. An attempt to extract the product into dichloromethane caused the product to crystallize from the mixture. The product was isolated, washed with dichloromethane and dried; yield 1.28 g. This material was purified by chromatography using silica gel and 7% methanol saturated with ammonia in dichloromethane to yield N-(2,3,4,6,11,11a-hexahydro-1H-pyrazino[1,2-b]isoquinolin-8-yl)-2-thiophenecarboximidamide (0.83 g), m.p. 228° C. (dec.), MS 313 (M+H)+.

Provenance & Evidence