反应详情

A solution of compound 81 (0.5 g, 1.364 mmol) in 2 M NH3 in methanol (20 mL) was treated with Pd—C (0.05 g) and flushed with hydrogen gas. The reaction was stirred at room temperature for over night (16 h) under hydrogen atm. (balloon pressure). The solution was filtered using celite bed and washed with CH2Cl2:methanol (1:1, 3×20 mL). The solvent was evaporated and crude was purified by column chromatography (EtOAc: Hexanes, 1:1) to obtain compound 82 (0.46 g, quantitative) as a solid in 1:2 ratio of diastereomers. 1H NMR (DMSO-d6) δ 1.38, 1.41 (2s, 9H), 1.46-1.84 (m, 6H), 2.02-2.17 (m, 2H), 2.53-2.57 (m, 1H), 2.60-2.72 (2s, 3H), 3.82-3.85 (m, 1H), 4.41 (brs, 2H), 6.42-6.50 (m, 1H), 6.66-6.68 (m, 1H), 6.85-6.87, 6.99-7.06 (2m, 2H), 10.23, 10.28 (2s, 1H); ESI-MS m/z (%): 366 (M.Na+, 8), 344 (MH+, 10), 288 (100).

1. customflushed with hydrogen gas
2. filtrationThe solution was filtered
3. washwashed with CH2Cl2:methanol (1:1, 3×20 mL)
4. customThe solvent was evaporated
5. customcrude was purified by column chromatography (EtOAc: Hexanes, 1:1)