反应详情

To a solution of 4-[2-(2-isopropyl-2H[1,2,4]triazol-3-yl)-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulen-8-yl]-1,2,5,6-tetrahydro-pyridine-3-carboxylic acid amide (0.15 g, 0.35 mmol) in DCM (16 mL) and methanol (8 mL) was added formaldehyde (0.053 mL, 37% aq., 0.7 mmol), sodium triacetoxyborohydride (0.11 g, 0.52 mmol) and acetic acid (24 μL, 0.42 mmol). The reaction mixture was stirred at RT for 16 h. Sodium hydrogen carbonate (aq.) and 10% Methanol in DCM were added to the mixture and the organic fraction separated, dried (Na2SO4), filtered and concentrated in vacuo. The resultant residue was subjected to flash chromatography (SiO2, gradient 0 to 10% methanol in DCM) to give 414 (94 mg, 62%). LCMS: RT=2.31 min, [M+H]+=434. 1H NMR 400 MHz (DMSO-d6) δ: 8.32 (1 H, d, J=8.35 Hz), 7.92 (1 H, s), 7.91 (1 H, d, J=0.62 Hz), 7.11 (1 H, br, s), 7.08 (1 H, dd, J=8.37, 1.83 Hz), 7.02 (1 H, br, s), 6.98 (1 H, d, J=1.79 Hz), 5.94-5.86 (1 H, m), 4.53-4.46 (4 H, m), 3.15 (2 H, s), 2.61 (2 H, s), 2.46 (2 H, s), 2.35 (3 H, s), 1.48 (6 H, d, J=6.60 Hz)

1. customthe organic fraction separated
2. dry with materialdried (Na2SO4)
3. filtrationfiltered
4. concentrationconcentrated in vacuo