Acetaldehyde, 2,2-dimethoxy- → HCID 19699494, compound

Participants

Reaction Steps

A mixture of (S)-5,7-difluoro-1,2,3,4-tetrahydronaphthalen-2-ylamine (2.05 g, 11.2 mmol), prepared as in Example 8, and dimethoxyacetaldehyde (1.73 g, 13.1 mmol) in 50 mL of ethanol was hydrogenated over 10% palladium on carbon (500 mg) for 18 hours. The mixture was filtered and concentrated by evaporation. The residue was combined with potassium thiocyanate (1.57 g, 16.2 mmol) in 30 mL of 1 N hydrochloric acid and 20 mL of ethanol and the mixture was heated at 70°-80° C. for 18 hours. The mixture was cooled in an ice bath giving a crystalline material which was isolated by filtration. Recrystallization from ethyl acetate/hexane gave 1-(5,7-difluoro-1,2,3,4-tetrahydronaphthalen-2-yl)-1,3-dihydroimidazole-2-thione (1.27 g, 4.76 mmol), m.p. 250°-251° C.

Provenance & Evidence