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

HRID 1017948Notes

Reaction equation

HRID 1017948 reaction equation
COC1C=C(C(C2C=CC(OC)=C(OC)C=2)=CC(OC)=O)C=CC=1OC.[CH3:27][O:28][C:29]1[CH:30]=[C:31]([CH:40]=[CH:41][C:42]=1[O:43][CH3:44])[C:32]([C:34]1[CH:39]=[CH:38][N:37]=[CH:36][CH:35]=1)=O.C(OP([CH2:53][C:54]#[N:55])(=O)OCC)C.C[Si](C)(C)[N-][Si](C)(C)C.[Li+]>CCCCCC>[CH3:27][O:28][C:29]1[CH:30]=[C:31]([C:32]([C:34]2[CH:39]=[CH:38][N:37]=[CH:36][CH:35]=2)=[CH:53][C:54]#[N:55])[CH:40]=[CH:41][C:42]=1[O:43][CH3:44]

Participants

6

Reactant 4

HCID 75676Diethyl (cyanomethyl)phosphonateHCID 2733832Lithium HexamethyldisilazideHCID 9820154Methyl 3,3-bis-(3,4-dimethoxyphenyl)acrylateHCID 215846084-(3,4-Dimethoxybenzoyl)pyridine

Product 1

HCID 542468793-(3,4-Dimethoxyphenyl)-3-pyridin-4-ylacrylonitrile

Reagents, catalysts & solvents 1

HCID 8058HexaneSolvent

Procedure

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.

Workup

  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

Sources & evidence

ORD record
ord-ece3cab3037545d587f8f43f41a58e72
Source dataset
uspto-grants-2002_11
Patent number
US06479554B2

Reaction notes

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