1-Methylimidazole → HCID 58712131, 화합물

To a solution of N-t-Boc-glycine (357 mg, 2 mmol) and N-methyl-imidazole (0.162 mL, 2 mmol) in THF (16 mL) cooled with ice methanesulfonyl chloride (0.158 mL, 2 mmol) was added. Ice batch was removed, compound 5 (0.4 g, 1 mmol) was added as a solid, followed by thriethylamine (0.144 mL, 2.02 mmol), and the reaction mixture was stirred at 40-50° C. overnight. A resulted solution was decanted from a solid, a flask rinsed with EtOAc, and a combined organic solution was washed with saturated ammonium chloride solution, then twice with water, brine and dried over anhydrous sodium sulfate. The solution was filtered out through a celite pad, concentrated and the residue was dissolved in 2-propanol (3 mL) with heating, and hexane (1-2 mL) was added drop-wise to start precipitation. In 1 hour a solid was filtered out, washed with 1:1 Hexane:ether mixture (10 ml×2) and vacuum-dried to give compound 6, 0.49 g (93.7%), LC purity 99%. 1H NMR (DMSO-d6): δ 9.11 (s, 1H), 8.81 (s, 1H), 8.22 (s, 1H), 7.24 (m, 1H), 7.20-7.15 (m, 2H), 6.91 (s, 2H), 3.87 (s, 3H), 3.73 (m, 2H), 3.70 (s, 3H), 3.66 (s, 6H). 1.40 (s, 9H).