反应详情

(3,5-Dimethoxyphenyl)-(2,3,4-trimethoxyphenyl)methanone (1.15 g, 3.46 mmol), cyanomethylphosphonic acid diethyl ester (1.09 ml, 6.92 mmol) in anhydrous THF (8 ml), and lithium bis(trimethylsilyl)amide (1.0 M solution in THF, 6.92 ml, 6.92 mmol) were treated in the same manner as described above for the synthesis of 3-(2,3-dihydrobenzo[1,4]dioxin-6-yl)-3-(3,5-dimethoxyphenyl)acrylonitrile. The crude material was purified via flash column chromatography (20% EtOAc in hexane) to give 3-(3,5-dimethoxy-phenyl)-3-(2,3,4-trimethoxy-phenyl)-acrylonitrile as a pink oil (1.20 g, 98%): 1HNMR (DMSO-d6) δ 7.00-6.84 (m, 2H, Ar), 6.62-6.59 (m, 1H, Ar), 6.45 (d, J=2 Hz, 2H, Ar), 6.01 (s, 0.51H, double bond proton), 3.87-3.44 (multiple singlets, 15H, 5OCH3); 13C NMR (CDCl3) δ 160.9, 160.8, 160.7, 160.2, 155.5, 155.4, 152.5, 151.8, 142.7, 142.6, 141.4, 140.5, 126.2, 125.8, 125.4, 124.1, 118.0, 117.8, 107.2, 107.0, 105.7, 102.0, 101.9, 96.8, 96.6, 61.1, 61.0, 60.9, 56.2, 55.7, 55.6; Anal. Calcd. For C20H21NO5: C, 67.59; H, 5.96; N, 3.94. Found: C, 67.53; H, 5.84; N, 3.88.

1. customThe crude material was purified via flash column chromatography (20% EtOAc in hexane)