Sodium Bicarbonate → (R)-N-(4-Fluoro-2-(2-(hydroxymethyl)-5-oxopyrrolidin-1-yl)benzyl)-3-(benzyloxy)-9,9-dimethyl-4-oxo-4,6,7,9-tetrahydropyrimido[2,1-c][1,4]oxazine-2-carboxamide

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of intermediate 166, (R)-N-(2-(2-((tert-butyldimethylsilyloxy)methyl)-5-oxopyrrolidin-1-yl)-4-fluorobenzyl)-3-(benzyloxy)-9,9-dimethyl-4-oxo-4,6,7,9-tetrahydropyrimido[2,1-c][1,4]oxazine-2-carboxamide (0.10 g, 0.150 mmol) in tetrahydrofuran (5 mL) at 23° C. was added a solution of tetrabutylammonium fluoride (1M in tetrahydrofuran) (180 μL, 0.18 mmol). The reaction mixture was stirred at 23° C. for 3 h. NaHCO3 (1N in H2O, 30 mL) was then added and the organic material was extracted with ethyl acetate (2×25 mL). The combined organic extracts were dried (MgSO4), filtered and concentrated in vacuo. The residue was purified on a Biotage system using a silica gel column with ethyl acetate/Hexanes (1:1) to ethyl acetate 100% as eluent to afford the title compound (0.060 g, 73% yield): 1HNMR 400 MHz (MeOD) δ (ppm): 7.55 (1H, dd, (t), 6.6 Hz), 7.43 (2H, m), 7.13 (1H, dd, J=9.5, 2.4 Hz), 7.03 (1H, m), 5.26 (2H, s), 4.57 (1H, m), 4.32 (2H, m), 4.08 (2H, t, J=5.0 Hz), 7.03 (2H, t, J=5.0 Hz), 3.53 (2H, m), 2.69–2.56 (2H, m), 2.38 (1H, m), 2.22 (1H, m), 1.62 (6H, s). LCMS (M+H)+ m/z 551.

Provenance & Evidence