反应详情

3-ethoxy-4-methoxybenzaldehyde (0.92 g, 5.12 mmol), 6-bromo-2,3-dihydro-benzo[1,4]dioxine (1.21 g, 5.63 mmol), and n-butyl lithium (2.25 ml, 5.63 mmol) were treated in the same manner as described above for the synthesis of (2,3-dihydrobenzo[1,4]dioxin-6-yl)-(3,5-dimethoxyphenyl)methanol. The crude material was purified via flash column chromatography (10% EtOAc in hexane gradient to 40% EtOAc in hexane in about 40 min.) to give (2,3-dihydro-benzo[1,4]dioxin-6-yl)-(3-ethoxy-4-methoxy-phenyl)-methanol as a yellow solid (0.91 g, 56%): 1HNMR (CDCl3) 6.92-6.80 (m, 6H, Ar), 5.68 (d, J=3 Hz, 1H, CHOH), 4.23 (s, 4H, 2CH2), 4.07 (q, J=6.90, 14 Hz, 2H, CH2CH3), 3.85 (s, 3H, OCH3), 2.13 (d, J=2 Hz, 1H, OH), 1.44 (t, J=7 Hz, 3H, CH2CH3). The product was carried over to the next step.

1. customThe crude material was purified via flash column chromatography (10% EtOAc in hexane gradient to 40% EtOAc in hexane in about 40 min.)