反应详情

To a solution of Intermediate 26d (19 mg, 0.024 mmol) in THF (1 mL) at −30° C. was added TBAF (1M in THF, 36 μL, 0.036 mmol) and the mixture was allowed to warm to RT over 1 h. The reaction mixture was applied to an SCX-2 cartridge (2 g) and washed with MeOH. The product was eluted with 2M NH3 in MeOH; concentration in vacuo gave a residue. Purification by HPLC (C6-Ph column, 35-75% MeCN in H2O, 0.1% HCO2H) gave the title compound as an off-white powder after freeze-drying (10.0 mg, 60%). LCMS (Method 5): Rt 4.00 min, m/z 621 [MH+]. 1H NMR (400 MHz, CDCl3): 1.29 (9H, s), 1.89-2.09 (4H, m), 2.13-2.29 (2H, m), 2.34 (3H, s), 3.35 (1H, td, J 9.2, 4.6), 3.45 (1H, d, J 11.1), 3.50 (1H, dd, J 11.1, 4.3), 3.60 (1H, m), 4.51 (1H, m), 5.04 (1H, td, J 8.5, 5.3), 5.15 (1H, t, J 4.1), 5.57 (1H, d, J 8.6), 6.26 (1H, s), 6.67 (1H, br s), 6.89 (1H, dd, J 9.9, 1.7), 7.15 (2H, d, J 7.1), 7.24-7.29 (4H, m), 7.30-7.38 (4H, m).

1. washwashed with MeOH
2. washThe product was eluted with 2M NH3 in MeOH
3. concentrationconcentration in vacuo
4. customgave a residue
5. customPurification by HPLC (C6-Ph column, 35-75% MeCN in H2O, 0.1% HCO2H)