Methyl Isocyanate → 4-(4-Fluorobenzyl)-N-methyl-3-oxopiperazine-1-carboxamide
反応式
[F:1][C:2]1[CH:15]=[CH:14][C:5]([CH2:6][N:7]2[CH2:12][CH2:11][NH:10][CH2:9][C:8]2=[O:13])=[CH:4][CH:3]=1.[CH3:16][N:17]=[C:18]=[O:19]>C1COCC1>[F:1][C:2]1[CH:15]=[CH:14][C:5]([CH2:6][N:7]2[CH2:12][CH2:11][N:10]([C:18]([NH:17][CH3:16])=[O:19])[CH2:9][C:8]2=[O:13])=[CH:4][CH:3]=1参加物
4
実験手順
1-(4-Fluorobenzyl)piperazin-2-one (0.40 g, 1.9 mmol, Example 1, Step 4) was dissolved in anhydrous THF (20 mL) under nitrogen and methyl isocyanate (0.96 mL, 1.9 mmol, 2M solution in THF) was added. The reaction was allowed to stir for two hours at room temperature. The solvent was removed in vacuo and the residue was purified by flash chromatography on silica gel using a 0-5% MeOH/CHCl3 gradient elution. Collection and concentration of the appropriate fractions provided the title compound as a white solid. 1H NMR (400 MHz, d6 DMSO) δ 7.29 (m, 2H), 7.16 (m, 2H), 6.55 (d, 1H, J=4.2 Hz), 4.51 (s, 2H), 3.97 (s, 2H), 3.50 (t, 2H, J=5.4 Hz), 3.22 (t, 2H, J=5.4 Hz), and 2.56 (d, 3H, J=4.4 Hz); ES MS (M+1)=266.