反应详情

A solution of 3a (200 mg, 0.66 mmol) and sodium thiomethoxide (47 mg, 0.67 mmol) in 2 mL of anhydrous DMF was stirred for 2 days at room temperature and then concentrated to dryness. The crude product was purified by column chromatography using chloroform:methanol (7:1) as eluent. The desired fractions were collected, concentrated and dried in vacuo: yield 102 mg (49%); MS m/z 312 (M+H)+; 1HNMR (DMSO-d6) δ 8.09 (s, 1H, H-2), 7.12 (bs, 2H, 6-NH2), 5.77 (d, 1H, H-1′, J1′,2′=5.7 Hz), 5.38 (bd, 1H, OH-2′, J2′-2′OH=4.4 Hz), 5.31 (d, 1H, OH-3′, J3′-3′OH=4.2 Hz), 5.15 (bddd, 1H, H-2′, J1′,2′=5.7 Hz, J2′,3′=5.7 Hz, J2′-2′OH=4.4 Hz), 4.20 (ddd, 1H, H-3′, J2′,3′=5.7 Hz, J3′,4′=3.6 Hz, J3′-3′OH=4.2 Hz), 3.97-4.05 (m, 1H, H-4′), 2.74-2.92 (m, 2H, 5′-CH2), 2.54 (s, 3H, 8-CH3), 2.03 (s, 3H, S—CH3).

1. concentrationconcentrated to dryness
2. customThe crude product was purified by column chromatography
3. customThe desired fractions were collected
4. concentrationconcentrated
5. customdried in vacuo