反应详情

(3,4-dimethoxyphenyl)-(4-methoxyphenyl)methanone (2.00 g, 7.35 mmol), cyanomethylphosphonic acid diethyl ester (2.31 ml, 14.69 mmol) in anhydrous THF (10 ml), and lithium bis(trimethylsilyl)amide (1.0 M solution in THF, 14.69 ml, 14.69 mmol) were treated in the same manner as described above for the synthesis of 3-(3,5-dimethoxy-phenyl)-3-(3-methoxy-phenyl)-acrylonitrile. The crude was purified via flash column chromatography (5% EtOAc in hexane gradient to 30% EtOAc in hexane in about 40 min.) to give 3-(3,4-dimethoxy-phenyl)-3-(4-methoxy-phenyl)-acrylonitrile as a pink oil (2.08 g, 96%): 1HNMR (DMSO-d6) δ 7.34-6.7 (m, 7H, Ar), 6.14 (s, 0.50H, double bond proton of one isomer), 6.08 (s, 0.45H, double bond proton of the other isomer), 3.83-3.73 (multiple singlets, 9H, 3OCH3); 13C NMR(CDCl3)δ 162.6, 162.5, 161.6, 161.2, 151.2, 150.7, 149.0, 148.8, 132.2, 131.7, 131.5, 130.3, 129.8, 129.5, 123.2, 122.3, 118.8, 118.8, 114.1, 114.0, 112.9, 111.5, 110.9, 91.9, 91.8, 56.2, 56.1, 56.1, 55.5, 55.5; Anal. Calcd. For C18H17NO3: C, 71.92; H, 6.19; N, 4.32 (+0.04H2O). Found: C, 71.95; H, 6.04; N, 4.54.

1. customThe crude was purified via flash column chromatography (5% EtOAc in hexane gradient to 30% EtOAc in hexane in about 40 min.)