反应详情

Benzo[1,3]dioxole-5-carbaldehyde (1.80 g, 11.96 mmol), 5-bromobenzo[1,3]dioxole (2.65 g, 13.16 mmol), and n-butyl lithium (5.26 ml, 13.16 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 (5% EtOAc in hexane gradient to 40% EtOAc in hexane in about 40 min.) to give bis-benzo[1,3]dioxol-5-yl-methanol as a light brown oil (2.69 g, 83%): 1HNMR (CDCl3) 6.86-6.74 (m, 6H, Ar), 5.93 (s, 4H, 2CH2), 5.68 (d, J=3 Hz, 1H, CHOH), 2.16 (d, J=3 Hz, 1H, OH). The product was carried over to the next step.

1. customThe crude material was purified via flash column chromatography (5% EtOAc in hexane gradient to 40% EtOAc in hexane in about 40 min.)