Reaction Steps
To a solution of benzyl 3-(3-((((3aR,4R,6R,6aR)-6-(4-((2,4-dimethoxybenzyl)amino)-7H-pyrrolo[2,3-d]pyrimidin-7-yl)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)methyl)(isopropyl)amino)cyclobutyl)propanoate (2.7 g, 3.78 mmol) in THF/MeOH (15 mL/15 mL) was added a solution of LiOH.H2O (1.6 g, 37.82 mmol) in water (5 mL). The mixture was stirred at 30° C. for 2 h. The volatiles were removed under reduced pressure. To the residue was diluted with water (10 mL) and extracted with EA (15 mL×2). The suspension water layers were adjusted to pH=3-4 with 1 N HCl solution and extracted with EA (30 mL×3). The combined organic layers were washed with brine (50 in L). The organic phase was dried over Na2SO4, filtered and concentrated to afford the desired compound as a yellow solid (2.9 g). 1H NMR (500 MHz, MeOD): δH 8.20 (s, 1H), 7.92 (s, 0.5H), 7.38-7.32 (m, 3H), 7.28-7.23 (m, 1.5H), 7.14 (d, J=8.5 Hz, 1H), 6.68 (brs, 1H), 6.56 (d, J=2.0 Hz, 1H), 6.44 (d, J=8.5 Hz, 1H), 6.25 (s, 1H), 5.51-5.47 (m, 1H), 5.18-5.13 (m, 1H), 4.66 (s, 2H), 4.61 (s, 1H), 4.43-4.40 (m, 1H), 3.96-3.90 (m, 0.5H), 3.85 (s, 3H), 3.77 (s, 3H), 3.65-3.58 (m, 0.5H), 3.50-3.40 (m, 2H), 2.46-2.36 (m, 1H), 2.20-2.00 (m, 4H), 1.98-1.70 (m, 2.5H), 1.70-1.58 (m, 4.5H), 1.40 (s, 3H), 1.18 (d, J=5.0 Hz, 3H), 0.90 (t, J=6.0 Hz, 3H) ppm; ESI-MS (m/z): 624.3 [M+1]+.
