反应详情

To a solution of Intermediate 85k (250 mg, 0.310 mmol) in THF (10 mL) at −30° C. was added TBAF (1M in THF, 620 μL, 0.620 mmol) and the mixture was allowed to warm to RT over 2 h. The reaction mixture was applied to an SCX-2 cartridge (10 g) and washed with MeOH. The product was eluted with 2M NH3 in MeOH; concentration in vacuo gave a residue. FCC, using 0-10% [2M NH3 in MeOH] in DCM, gave a crude product. Recrystallisation from hot diethyl ether (50 mL), EtOAc (10 mL) and cyclohexane (20 mL) gave the title compound as a white powder (113 mg, 56%). LCMS (Method 5): Rt 3.68 min, m/z 649.1 [MH+]. 1H NMR (400 MHz, d4-MeOD): 1.29 (9H, s), 1.86-2.34 (11H, m), 2.38 (3H, s), 3.02 (1H, m), 3.09 (1H, dt, J 8.8, 3.5), 4.07 (1H, d, J 11.0), 4.25 (1H, d, J 4.3), 4.52 (1H, br s), 4.90 (1H, m), 5.25 (1H, t, J 4.3), 6.33 (1H, s), 7.18-7.36 (9H, m), 7.62 (1H, d J 7.6), 8.44 (1H, s).

1. washwashed with MeOH
2. washThe product was eluted with 2M NH3 in MeOH
3. concentrationconcentration in vacuo
4. customgave a residue
5. customgave a crude product
6. customRecrystallisation from hot diethyl ether (50 mL), EtOAc (10 mL) and cyclohexane (20 mL)