反应详情

A solution of 6-(5-diethoxymethyl-furan-3-yl)-4,4-dimethyl-1,4-dihydro-benzo[d][1,3]oxazin-2-one (1.1 g, 3 mmol) was stirred in THF (20 mL) and 2N HCl (2 mL) for 1 hour. The crystalline product was filtered and dried (0.52 g, 69%): mp 262-263° C.; 1H NMR (DMSO-d6) δ10.3 (s, 1H), 9.65 (s, 1H), 8.59 (s, 1H), 8.04 (s, 1H), 7.65-7.64 (d, 1H, J=1.5 Hz),7.61-7.60 (d, 1H, J=1.8 Hz), 7.59-7.58 (d, 1H, J=1.8 Hz), 6.94-6.91 (d, 1H, J=8.2 Hz), 1.65 (s, 6H). MS (ESI) m/z 270 [M−H]−.

1. filtrationThe crystalline product was filtered
2. customdried (0.52 g, 69%)