Dimethylformamide → HCID 54529357, compound

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Reaction Steps

A solution of (S)-1-(5,7-difluoro-1,2,3,4-tetrahydronaphthalen-2-yl)-5-hydroxymethyl-1,3-dihydroimidazole-2-thione (140 mg, 0.47 mmol), prepared as in Example 18, in 20 mL of THF and I drop of DMF was cooled to between 0° and 5° C. and thionyl chloride (13.7 M, 109 μL, 1.49 mmol) was added drop-wise under a nitrogen atmosphere. The mixture was stirred at room temperature for 0.5 hours, under reflux for 0.5 hours and again at room temperature for 0.5 hours. The mixture then was cooled to between 0° and 5° C. and pyrrolidine (12.0 M, 818 μL, 9.8 mmol) was added drop-wise. The mixture was stirred under reflux for 1.5 hours. The solvents were removed by evaporation and the residue was diluted with water. Ethyl acetate was added to the dilution and the mixture was adjusted to pH 7. The ethyl acetate layer was dried and concentrated by evaporation. Purification of the residue by column chromatography gave (S)-1-(5,7-difluoro-1,2,3,4-tetrahydronaphthalen-2-yl)-1,3-dihydro-5-(pyrrolidin-1-ylmethyl)-imidazole-2-thione (100 mg, 0.29 mmol). [α]D =-10.96° (C=1.3, DMSO).

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