反应详情

To a stirred solution of Example 68 (605 mg, 0.82 mmol) in DCM (8 mL) was added formaldehyde solution (37 wt % in H2O, 610 μL, 8.19 mmol), followed by acetic acid (47 μL, 0.82 mmol), and then sodium triacetoxyborohydride (347 mg, 1.64 mmol) and the reaction stirred at RT under a N2 atmosphere. After 3 h, the reaction was partitioned between H2O and DCM, and passed through a phase separator cartridge. The organics were concentrated in vacuo and subjected to FCC, eluting with 0-7.5% 2M NH3 in MeOH/DCM, and the product purified further by HPLC (XBridge C18 column, 45-85% MeCN in H2O, 0.1% NH4OH, 20 min gradient, 18 mL/min) to afford the title compound (331 mg, 54%). LCMS (Method 5): Rt 3.61 min, m/z 752, 754 [MH+]. 1H NMR (400 MHz, d6-DMSO): 1.27 (9H, s), 1.58-1.65 (2H, m), 1.65-1.77 (6H, m), 1.80-1.97 (4H, m), 2.11 (3H, s), 2.12-2.23 (4H, m), 3.14 (4H, t, J=5.1 Hz), 4.45-4.55 (1H, m), 4.76-4.83 (1H, m), 5.55 (1H, t, J=4.3 Hz), 6.33 (1H, s), 7.04 (1H, broad d, J=8.4 Hz), 7.08 (1H, dd, J=2.3, 8.6 Hz), 7.15 (1H, dd, J=2.2, 9.7 Hz), 7.22-7.36 (4H, m), 7.36-7.41 (1H, m), 7.52-7.56 (1H, m), 7.59-7.65 (2H, m), 8.13 (1H, s).

1. customthe reaction was partitioned between H2O and DCM
2. concentrationThe organics were concentrated in vacuo
3. washeluting with 0-7.5% 2M NH3 in MeOH/DCM
4. customthe product purified further by HPLC (XBridge C18 column, 45-85% MeCN in H2O, 0.1% NH4OH, 20 min gradient, 18 mL/min)