Diethyl (cyanomethyl)phosphonate → HCID 69205129, compound

HRID 2378186Notes

Reaction equation

HRID 2378186 reaction equation
[CH3:1][O:2][C:3]1[C:8]([O:9][CH3:10])=[CH:7][CH:6]=[CH:5][C:4]=1[C:11]([C:13]1[CH:18]=[C:17]([O:19][CH3:20])[CH:16]=[C:15]([O:21][CH3:22])[CH:14]=1)=O.C(OP([CH2:31][C:32]#[N:33])(=O)OCC)C.C[Si]([N-][Si](C)(C)C)(C)C.[Li+].O1C2C=CC(C(C3C=C(OC)C=C(OC)C=3)=CC#N)=CC=2OCC1>C1COCC1>[CH3:1][O:2][C:3]1[C:8]([O:9][CH3:10])=[CH:7][CH:6]=[CH:5][C:4]=1[C:11]([C:13]1[CH:18]=[C:17]([O:19][CH3:20])[CH:16]=[C:15]([O:21][CH3:22])[CH:14]=1)=[CH:31][C:32]#[N:33]

Participants

6

Reactant 4

HCID 75676Diethyl (cyanomethyl)phosphonateHCID 2733832Lithium HexamethyldisilazideHCID 69202433HCID 69202433, compoundHCID 692032153-(2,3-Dihydrobenzo[1,4]dioxin-6-yl)-3-(3,5-dimethoxyphenyl)acrylonitrile

Product 1

HCID 69205129HCID 69205129, compoundYield 91%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

(2,3-Dimethoxyphenyl)-(3,5-dimethoxyphenyl)methanone (1.19 g, 3.94 mmol), cyanomethylphosphonic acid diethyl ester (1.24 ml, 7.87 mmol) in anhydrous THF (20 ml), and lithium bis(trimethylsilyl)amide (1.0 M solution in THF, 7.9 ml, 7.87 mmol) were treated in the same manner as described above for the synthesis of 3-(2,3-dihydrobenzo[1,4]dioxin-6-yl)-3-(3,5-dimethoxyphenyl)acrylonitrile. The crude material was purified via flash column chromatography (5% EtOAc in hexane gradient to 20% EtOAc in hexane in about 40 min.) to give 3-(2,3-Dimethoxy-phenyl)-3-(3,5-dimethoxy-phenyl)-acrylonitrile as a clear light pink oil (1.16 g, 91%): 1HNMR (DMSO-d6) δ 7.21-7.08 (m, 2H, Ar), 6.83-6.79 (m, 1H, Ar), 6.62-6.56 (m, 1H, Ar), 6.47-6.46 (m, 2H, Ar), 6.00 (s, 1H, double bond proton), 3.86-3.72 (multiple singlets, 12H, 4OCH3): 13C NMR (CDCl3) δ 161.0, 160.9, 160.7, 160.4, 153.2, 153.1, 147.3, 146.7, 140.5, 140.1, 133.9, 131.7, 124.3, 124.0, 122.5, 122.2, 117.7, 117.5, 114.1, 107.0, 105.7, 102.0, 101.9, 97.8, 97.2, 60.9, 60.7, 56.1, 56.0, 55.7, 55.6; Anal. Calcd. For C19H19NO4: C, 73.20; H, 5.80; N, 4.74. Found: C, 73.10; H, 5.72; N, 4.68.

Workup

  1. customThe crude material was purified via flash column chromatography (5% EtOAc in hexane gradient to 20% EtOAc in hexane in about 40 min.)

Sources & evidence

ORD record
ord-df30d40c8735476b9e83abfc4c60f7c4
Source dataset
uspto-grants-2008_12
Patent number
US07470723B2

Reaction notes

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