Diethyl (cyanomethyl)phosphonate → 3-(3,4-Dimethoxyphenyl)-3-pyridin-4-ylacrylonitrile

3-(3,4-Dimethoxyphenyl)-3-pyridin-4-ylacrylonitrile was prepared analogously to methyl 3,3-bis-(3′,4′-dimethoxyphenyl)acrylate using 4-(3,4-dimethoxybenzoyl)pyridine (1 g,4 mmol), diethylcyanomethylphosphonate (0.73 mL, 4.4 mmol) and lithium hexamethyldisilazide (3.4 mL, 4.4 mmol, 1.3 M) with a reaction time of 24 hours at room temperature. The crude product was slurried in 10 mL of hexane. The mixture was filtered, the solid was washed with hexane, air dried and then dried in vacuo to afford 0.91 g (85%) of a mixture of the E and Z isomers as an off white solid: mp 116-125° C.; 1H NMR (CDCl3) δ 8.80-8.63 (m, 4 H), 7.40-7.20 (m, 4 H), 7.04-6.74 (m, 6 H), 5.81 (s, 1 H), 5.70 (s, 1 H), 3.94 (s, 3 H), 3.92 (s, 3 H), 3.87 (s, 3 H), 3.84 (s, 3 H); 13C NMR (CDCl3) δ 160.1, 157.0, 151.6, 151.1, 150.3, 149.2, 148.9, 146.7, 144.9, 129.6, 127.8, 123.7, 123.1, 122.7, 122.1, 117.4, 117.1, 112.3, 111.0, 110.5, 96.1, 94.8, 56.0, 56.0; Anal. Calcd for C16H14N2O2. Theoretical: C, 72.17; H, 5.30; N, 10.52. Found: C, 72.35; H, 5.43; N, 10.47.

1. customwith a reaction time of 24 hours
2. customat room temperature
3. filtrationThe mixture was filtered
4. washthe solid was washed with hexane, air
5. customdried
6. customdried in vacuo

ORD-Eintrag

ord-ece3cab3037545d587f8f43f41a58e72

Quelldatensatz

uspto-grants-2002_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06479554B2