Diethyl (cyanomethyl)phosphonate → 3-[3-(Tert-butyldimethylsilanyloxy)-4-methoxyphenyl]-3-(3,5-dimethoxyphenyl)acrylonitrile

HRID 2378166Notes

Reaction equation

HRID 2378166 reaction equation
[Si:1]([O:8][C:9]1[CH:10]=[C:11]([C:17]([C:19]2[CH:24]=[C:23]([O:25][CH3:26])[CH:22]=[C:21]([O:27][CH3:28])[CH:20]=2)=O)[CH:12]=[CH:13][C:14]=1[O:15][CH3:16])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].C(OP([CH2:37][C:38]#[N:39])(=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>[C:4]([Si:1]([CH3:2])([CH3:3])[O:8][C:9]1[CH:10]=[C:11]([C:17]([C:19]2[CH:20]=[C:21]([O:27][CH3:28])[CH:22]=[C:23]([O:25][CH3:26])[CH:24]=2)=[CH:37][C:38]#[N:39])[CH:12]=[CH:13][C:14]=1[O:15][CH3:16])([CH3:6])([CH3:5])[CH3:7]

Participants

6

Reactant 4

HCID 75676Diethyl (cyanomethyl)phosphonateHCID 2733832Lithium HexamethyldisilazideHCID 692032153-(2,3-Dihydrobenzo[1,4]dioxin-6-yl)-3-(3,5-dimethoxyphenyl)acrylonitrileHCID 69204700[3-(Tert-butyldimethylsilanyloxy)-4-methoxyphenyl]-(3,5-dimethoxyphenyl)methanone

Product 1

HCID 692025173-[3-(Tert-butyldimethylsilanyloxy)-4-methoxyphenyl]-3-(3,5-dimethoxyphenyl)acrylonitrileYield 74.1%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

[3-(tert-butyldimethylsilanyloxy)-4-methoxyphenyl]-(3,5-dimethoxyphenyl) methanone (0.74 g, 1.84 mmol), cyanomethylphosphonic acid diethyl ester (0.58 ml, 3.68 mmol) in anhydrous THF (10 ml), and lithium bis(trimethylsilyl)amide (1.0 M solution in THF, 3.70 ml, 3.68 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 was purified via flash column chromatography (100% hexane gradient to 20% EtOAc in hexane in about 40 min.) to give 3-[3-(tert-butyl-dimethyl-silanyloxy)-4-methoxy-phenyl]-3-(3,5-dimethoxy-phenyl)-acrylonitrile as an clear colorless oil (0.58 g, 74%): 1HNMR (CDCl3) δ 7.09-6.78 (m, 3H, Ar), 6.53-6.51 (m, 2H, Ar), 6.41 (d, J=2 Hz, 1H, Ar), 5.60 (s, 1H, CH), 3.86-3.76 (multiple singlets, 9H), 0.97 (s, 9H, 3OCH3), 0.14 (s, 6H, 2OCH3). The product was carried over to the next step.

Workup

  1. customThe crude was purified via flash column chromatography (100% hexane gradient to 20% EtOAc in hexane in about 40 min.)

Sources & evidence

ORD record
ord-d2022d5ef8924c61a235b1ad6e95aff6
Source dataset
uspto-grants-2008_12
Patent number
US07470723B2

Reaction notes

Loading…