反应详情

温度

90 °C

A mixture of 3a (660 mg, 2.20 mmol) in 33% methylamine/ethanol solution (30 mL) in a steel bomb was heated for 2 days at 90° C. The reaction mixture was concentrated to dryness and purified by column chromatography (elution with 4:1:0.3 chloroform:methanol:NH4OH). The desired fractions were combined, concentrated and dried in vacuo: yield 294 mg (45%); MS m/z 295 (M+H)+; 1HNMR (DMSO-d6) δ 8.08 (bs, 1H, H-2), 7.14 (bs, 2H, 6-NH2), 5.72 (d, 1H, H-1′, J1′,2′=6.5 Hz), 5.30 (d, 1H, 2′-OH, J2′-2′OH=6.3 Hz), 5.17 (bd, 1H, 3′-OH, J3′-3′OH=3.5 Hz), 5.01 (ddd, 1H, H-2′, J1′,2′=6.5 Hz, J2′,3′=5.5 Hz, J2′-2′OH=6.3 Hz), 4.16 (bs, 1H, H-3′), 3.96-4.0 (m, 1H, H-4′), 2.64-2.77 (bm, 2H, 5′-CH2), 2.53 (s, 3H, 8-CH3), 2.29 (s, 3H, 5′NH—CH3).

1. concentrationThe reaction mixture was concentrated to dryness
2. custompurified by column chromatography (elution with 4:1:0.3 chloroform:methanol:NH4OH)
3. concentrationconcentrated
4. customdried in vacuo