反应详情

To a solution of the product of Step C (3.52 g, 6.18 mmol, 1 eq) in THF (50 mL) at rt was added TBAF in THF (12.36 mL of a 1 M solution, 12.36 mmol, 2 eq). After 1 hr, water was added, the solution extracted with DCM, the organics combined, dried over MgSO4, and concentrated. Purification by chromatography (80 g column) eluting with 2 to 6% methanol/DCM with ammonia afforded the title compound of Step D. 1H NMR (CHLOROFORM-d) δ: 8.71 (s, 1H), 7.70 (s, 1H), 6.28 (dd, J=5.9, 2.0 Hz, 1H), 5.78 (dd, J=5.9, 2.0 Hz, 1H), 4.70-4.95 (m, 4H), 3.99-4.10 (m, 1H), 3.85-3.96 (m, 1H), 3.68 (br. s., 2H), 3.09-3.18 (m, 2H), 2.65 (dd, J=12.9, 7.4 Hz, 1H), 1.99-2.21 (m, 3H), 1.82-1.93 (m, 1H), 1.38-1.49 (m, 9H). Calculated for C22H28F3N3O4: 456.2 (M+1). found: 456.2.

1. extractionthe solution extracted with DCM
2. dry with materialdried over MgSO4
3. concentrationconcentrated
4. customPurification by chromatography (80 g column)
5. washeluting with 2 to 6% methanol/DCM with ammonia