反应详情

A solution of intermediate 6, ethyl 3-benzyloxy-4-oxo-4,6,7,9-tetrahydropyrimido[2,1-c][1,4]oxazine-2-carboxylate, (0.236 g, 0.714 mmol) in a mixture of ethyl acetate (60 ml) and ethanol (20 ml) was treated with 1 atm of hydrogen at 25° C. over 10% palladium on activated carbon (0.10 g) for 2.5 h to give 0.160 g (94% yield) of the title compound as white needles; mp 172-174° C. (ethyl acetate). 1HNMR 400 MHz (CDCl3) δ ppm: 1.47 (3H, t, J=7.3 Hz, CH3), 4.08 (4H, m, 2×CH2), 4.54 (2H, q, J=7.3 Hz, OCH2), 4.72 (2H, s, OCH2), 10.75 (1H, s, OH). Anal. Calcd for C10H12N2O5: C, 50.00; H, 5.03; N, 11.66. Found: C, 50.01; H, 4.95; N, 11.54.