反应详情

To a solution of (3-((((3aR,4R,6R,6aR)-6-(6-amino-9H-purin-9-yl)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)methyl)(methyl)amino)cyclobutyl)methanol taken directly from the previous step in DCM (25 ml) was added Et3N (467 mg, 4.62 mmol) and MsCl (264 mg, 2.31 mmol) as a solution in DCM (5 ml). The mixture was stirred for 2 h. Water (20 ml) and DCM (30 ml×2) was added. The organic layer was dried over Na2SO4 and concentrated, purified with Prep-TLC (DCM:MeOH=10:1) to give the title compound (390 mg, Yield 35% for two steps). 1H NMR (500 MHz, MeOD): δH 8.27 (s, 1H), 8.21 (s, 1H), 6.203-6.200 (m, 1H), 5.529 (dd, J=2.0, 7.0 Hz, 1H), 5.010 (dd, J=3.0, 6.0 Hz, 1H), 4.354 (dd, J=3.5, 8.0 Hz, 1H), 4.197-4.182 (m, 2H), 3.585 (brs, 1H), 3.073-2.948 (m, 5H), 2.595-2.513 (m, 2H), 2.394 ((brs, 114), 2.207 (brs, 1H), 2.107 (s, 3H), 2.030-1.989 (m, 1H), 1.840-1.811 (m, 2H), 1.586 (s, 3H), 1.390 (brs, 1H), 1.329-1.280 (m, 6H), 0.905-0.878 (m, 1H) ppm; ESI-MS (m/z): 483.3 [M+1]+.

1. dry with materialThe organic layer was dried over Na2SO4
2. concentrationconcentrated
3. custompurified with Prep-TLC (DCM:MeOH=10:1)