Diethyl (cyanomethyl)phosphonate → 3-(3,4-Dimethoxy-phenyl)-3-(4-methoxy-phenyl)-acrylonitrile

HRID 2378226Notes

Reaction equation

HRID 2378226 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([C:11]([C:13]2[CH:18]=[CH:17][C:16]([O:19][CH3:20])=[CH:15][CH:14]=2)=O)[CH:6]=[CH:7][C:8]=1[O:9][CH3:10].C(OP([CH2:29][C:30]#[N:31])(=O)OCC)C.C[Si]([N-][Si](C)(C)C)(C)C.[Li+].COC1C=C(C(C2C=CC=C(OC)C=2)=CC#N)C=C(OC)C=1>C1COCC1>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([C:11]([C:13]2[CH:18]=[CH:17][C:16]([O:19][CH3:20])=[CH:15][CH:14]=2)=[CH:29][C:30]#[N:31])[CH:6]=[CH:7][C:8]=1[O:9][CH3:10]

Participants

6

Reactant 4

HCID 75676Diethyl (cyanomethyl)phosphonateHCID 2733832Lithium HexamethyldisilazideHCID 2754574(3,4-Dimethoxyphenyl)(4-methoxyphenyl)methanoneHCID 692052993-(3,5-Dimethoxy-phenyl)-3-(3-methoxy-phenyl)-acrylonitrile

Product 1

HCID 692026013-(3,4-Dimethoxy-phenyl)-3-(4-methoxy-phenyl)-acrylonitrileYield 96%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

(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.

Workup

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

Sources & evidence

ORD record
ord-620c7a40c71b4578b2514de6d25b9447
Source dataset
uspto-grants-2008_12
Patent number
US07470723B2

Reaction notes

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