反应详情

A solution of methyl 3-oxocyclobutanecarboxylate (4.60 g, 35.94 mmol), 9-((3aR,4R,6R,6aR)-6-(aminomethyl)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)-9H-purin-6-amine (11.0 g, 35.94 mmol) and Ti(iPrO)4 (4.0 g, 14.08 mmol) in MeOH (80 mL) was stirred at 45° C. for 2 h, then NaCNBH3 (4.5 g, 71.87 mmol) was added. The reaction was stirred at RT overnight. The reaction was quenched with aq. sat. NaHCO3 (40 mL) and filtered, extracted with DCM (80 mL×3), dried over Na2SO4 and concentrated. The residue was purified by preparative-HPLC to obtain the title compound (6.2 g, Yield 41%). 1H NMR (500 MHz, CDCl3): δH 8.38-8.34 (m, 1H), 7.90 (s, 1H), 5.98 (d, J=3.0 Hz, 1H), 5.75 (br s, 2H), 5.48-5.46 (m, 1H), 5.03-5.01 (m, 1H), 4.35-4.33 (m, 1H), 3.69-3.66 (m, 3H), 3.50-3.17 (m, 1H), 3.05-2.73 (m, 3H), 2.48-2.44 (m, 2H), 1.95-1.91 (m, 2H), 1.62 (s, 3H), 1.39 (s, 3H) ppm; ESI-MS (m/z): 419.2[M+1]+.

1. customThe reaction was quenched with aq. sat. NaHCO3 (40 mL)
2. filtrationfiltered
3. extractionextracted with DCM (80 mL×3)
4. dry with materialdried over Na2SO4
5. concentrationconcentrated
6. customThe residue was purified by preparative-HPLC