A solution of tert-butyl 6-(adamantan-1-ylmethoxy)-5-cyclopropylnicotinate (0.50 g, 1.30 mmol) in dichloromethane (20 mL) was treated with trifluoroacetic acid (5.0 mL). The resulting mixture was stirred for 30 minutes and then concentrated in vacuo. The residue was treated with methanol (20 mL) and concentrated in vacuo. The residue was dissolved in anhydrous tetrahydrofuran (20 mL), treated with carbonyl diimidazole (0.42 g, 2.60 mmol), and refluxed under nitrogen for 30 min. The reaction mixture was cooled to ambient temperature and added (methylsulfamoyl)amine (0.43 g, 3.90 mmol) and 1,8-diazabicycloundec-7-ene (0.58 mL, 3.90 mmol). The reaction mixture was refluxed under nitrogen for 30 minutes. The reaction mixture was cooled to ambient temperature, diluted with ethyl acetate (50 mL), washed with 1 M aqueous hydrochloric acid solution (2×30 mL) and brine (30 mL); dried over anhydrous sodium sulfate; filtered and concentrated in vacuo. The residue was purified by silica gel column chromatography (2:1 hexanes:ethyl acetate (+0.2% acetic acid v/v)) to provide the title compound (0.12 g, 22%): 1H NMR (300 MHz, DMSO-d6) δ 11.65 (br s, 1H), 8.46 (d, J=2.3 Hz, 1H), 7.73 (d, J=2.3 Hz, 1H), 7.58-7.51 (m, 1H), 3.92 (s, 2H), 2.52-2.48 (m, 3H), 2.07-1.98 (m, 1H), 1.97-1.90 (m, 3H), 1.72-1.55 (m, 12H), 0.98-0.90 (m, 2H), 0.77-0.70 (m, 2H); MS (ES+) m/z 420.2 (M+1).
