Lithium Hexamethyldisilazide → 3-(3-Methoxy-4-nitro-phenyl)-3-(3,4,5-trimethoxy-phenyl)-acrylonitrile

Participants

Reaction Steps

3-(3-Methoxy-4-nitro-phenyl)-3-(3,4,5-trimethoxy-phenyl)-acrylonitrile (E and Z isomers) were prepared analogously to 3-(4-methoxy-3-nitro-phenyl)-3-(3,4-dimethoxy-phenyl)-acrylonitrile using (3-methoxy-4-nitro-phenyl)-(3,4,5-trimethoxy-phenyl)-methanone (1.2 g, 3.5 mmol), lithium bis(trimethylsilyl)amide (3.9 ml, 3.9 mmol) and diethyl cyanomethylphosphate (0.7 g, 3.9 mmol). The crude product was purified by flash chromatography (silica gel, CH2Cl2) to afford mixture isomers of 3-(3-methoxy-4-nitro-phenyl)-3-(3,4,5-trimethoxy-phenyl)-acrylonitrile (0.9 g, 70%): 1H NMR (CDCl3) δ 7.93 (dd, J=8.4 and 6 Hz, 1H), 7.06-6.96 (m, 2H), 6.65 (s, 1H), 6.46 (s, 2H), 5.80(5.71) (s, 1H), 4.00-3.81 (m, 12H).

Provenance & Evidence