反应详情

To a solution of 294 (0.33 g, 0.74 mmol) and pyridine (0.13 mL, 1.6 mmol) in DMF (15 mL) at 0° C. was added phenyl chloroformate (0.12 mL, 0.96 mmol). The reaction mixture was stirred for 15 min then cyclopropylamine (2.0 mL, 28 mmol) was added. The mixture was warmed to RT, stirred for an additional 18 h and partitioned between water and ethyl acetate. The organic phase was collected, washed with water, 1M NaOH, and brine, dried (anhydrous MgSO4), filtered and concentrated. The residue was purified by silica gel chromatography (20% methanol/ethyl acetate) to afford title compound 295 (0.21 g, 54%). 1H NMR (400 MHz, DMSO-d6) δ (ppm): 8.71 (s, 1H); 8.52-8.50 (m, 2H); 8.31 (s, 1H); 8.20 (d, J=8.2, 1H): 7.82 (dd, J=8.2, 2.2, 1H); 7.73 (dd, J=13.5, 2.5, 1H); 7.38 (t, J=9.0, 1H); 7.22-7.18 (m, 1H); 6.64 (d, J=5.5, 1H); 6.59 (d, J=2.5, 1H); 3.48 (t, J=7.0, 2H); 3.35 (t?, obscured by water peak), 2.85 (t, J=6.8, 2H); 2.58-2.52 (m, 1H); 2.16 (t. J=7.8, 2H); 1.89 (quintet, J=7.4, 2H); 0.68-0.63 (m, 2H); 0.45-0.41 (m, 2H). MS: (calc.) 531.17 (found) 532.4 (MH)+

1. stirringstirred for an additional 18 h
2. custompartitioned between water and ethyl acetate
3. customThe organic phase was collected
4. washwashed with water, 1M NaOH, and brine
5. dry with materialdried (anhydrous MgSO4)
6. filtrationfiltered
7. concentrationconcentrated
8. customThe residue was purified by silica gel chromatography (20% methanol/ethyl acetate)