反应详情

3-(3,4-Dimethoxyphenyl)-3-(4-methylphenyl)acrylonitrile was prepared analogously to methyl 3,3-bis-(3,4-dimethoxyphenyl)acrylate using 3,4-dimethoxy-4'-methylbenzophenone (2.3 g, 9 mmol), diethylcyanomethylphosphonate (1.8 mL, 9.9 mmol) and lithium hexamethyldisilazide (10 mL, 9.9 mmol, 1M) with a reaction time of 22 hours at room temperature. The crude product was purified by chromatography (silica gel, 1% ethyl acetate/methylene chloride) to afford 1.83 g (73%) of a mixture of the E and Z isomers as a white solid: mp 83.5-86.5° C.; 1H NMR (CDCl3) δ 7.35-7.20 (m, 8 H), 7.04-6.81 (m, 6 H), 5.62 (s, 1 H), 5.59 (s, 1 H), 3.90 (s, 3 H), 3.90 (s, 3 H), 3.88 (s, 3 H), 3.82 (s, 3 H), 2.41 (s, 3 H), 2.39 (s, 3 H); 13C NMR (CDCl3) δ 162.7, 162.6, 160.0, 150.4, 148.8, 148.5, 140.6, 140.1, 136.3, 134.1, 131.6, 129.5, 129.2, 129.0, 128.5, 123.0, 122.1, 118.4, 118.3, 112.6, 111.1, 110.7, 92.6, 92.4, 55.9, 55.9, 55.8, 21.3, 21.2; Anal. Calcd for C18H17NO2. Theoretical: C, 77.40; H, 6.13; N, 5.01. Found: C, 77.64; H, 5.93; N, 5.01.

1. customwith a reaction time of 22 hours
2. customat room temperature
3. customThe crude product was purified by chromatography (silica gel, 1% ethyl acetate/methylene chloride)