Water → Ethyl 3-(benzyloxy)-10-(((benzyloxy)carbonyl)amino)-4-oxo-4,6,7,8,9,10-hexahydro-7,10-ethanopyrimido[1,2-a]azepine-2-carboxylate

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Reaction Conditions

Reaction Steps

To a solution of ethyl 10-(((benzyloxy)carbonyl)amino)-3-hydroxy-4-oxo-4,6,7,8,9,10-hexahydro-7,10-ethanopyrimido[1,2-a]azepine-2-carboxylate (prepared according to the procedure in WO2009117540) (500 mg, 1.170 mmol) in DMF (20 mL) was added K2CO3 (323 mg, 2.339 mmol) followed by benzyl bromide (0.208 mL, 1.755 mmol) and the resulting mixture was heated at 50° C. for 16 h. After cooling to room temp, water was added and the mixture was extracted with ethyl acetate, dried (Na2SO4), filtered and concentrated. The crude product was purified by silica gel chromatography (20-100% ethyl acetate/hexane to afford the title compound (250 mg, 42% yield) as a light yellow liquid. 1H NMR (500 MHz, CDCl3) δ: 7.47 (d, 2H, J=7.02 Hz), 7.32-7.39 (m, 8H), 7.19 (brs, 1H), 5.26 (s, 2H), 5.08 (s, 2H), 4.31 (q, 2H, J=7.02 Hz), 4.13 (d, 2H, J=3.97 Hz), 2.87-2.96 (m, 2H), 2.46 (brs, 1H), 1.94-2.03 (m, 2H), 1.80-1.89 (m, 2H), 1.65-1.75 (m, 2H), 1.29 (t, 3H, J=7.32 Hz). LCMS (M+H)=518.28.

Provenance & Evidence