Sodium Cyanide → 2-Cyano-7-acetoxy-3-(3,4,5-trimethoxybenzoyl)-6-methoxy-benzofuran

HRID 218835Notes

Reaction equation

HRID 218835 reaction equation
Br[C:2]1[O:3][C:4]2[C:24]([O:25][C:26](=[O:28])[CH3:27])=[C:23]([O:29][CH3:30])[CH:22]=[CH:21][C:5]=2[C:6]=1[C:7](=[O:20])[C:8]1[CH:13]=[C:12]([O:14][CH3:15])[C:11]([O:16][CH3:17])=[C:10]([O:18][CH3:19])[CH:9]=1.[C-:31]#[N:32].[Na+]>CS(C)=O>[C:31]([C:2]1[O:3][C:4]2[C:24]([O:25][C:26](=[O:28])[CH3:27])=[C:23]([O:29][CH3:30])[CH:22]=[CH:21][C:5]=2[C:6]=1[C:7](=[O:20])[C:8]1[CH:13]=[C:12]([O:14][CH3:15])[C:11]([O:16][CH3:17])=[C:10]([O:18][CH3:19])[CH:9]=1)#[N:32]

Participants

4

Reactant 2

HCID 8929Sodium CyanideHCID 247865602-Bromo-7-acetoxy-3-(3,4,5-trimethoxybenzoyl)-6-methoxybenzofuran

Product 1

HCID 574219642-Cyano-7-acetoxy-3-(3,4,5-trimethoxybenzoyl)-6-methoxy-benzofuranYield 65%

Reagents, catalysts & solvents 1

HCID 679Dimethyl SulfoxideSolvent

Procedure

A mixture of 2-bromo-7-acetoxy-3-(3,4,5-trimethoxybenzoyl)-6-methoxybenzofuran (25 mg, 0.05 mmol) and sodium cyanide (15 mg, 0.38 mmol) in dry DMSO (1 mL) under nitrogen at room temperature was stirred for 3.5 hours (monitored by tlc), quenched with saturated ammonium chloride solution and diluted with ethylacetate (20 mL). The organic layer was separated, dried over magnesium sulfate and the solvent distilled to afford the crude material which was purified over silica gel column (eluent—Hexane: diethyl-ether 1:1 to 0:100) to afford the desired product as pale cream solid (13 mg, 65%); 1H NMR (300 MHz, CDCl3) δ: 7.29(d, 1H, J=8.71 Hz), 7.19(s, 2H, benzoyl Hs), 6.06(d, 1H, J=8.77 Hz), 5.82(b, 1H, OH), 3.99(s, 3H, OMe), 3.96(s, 3H, OMe), 3.88(s, 6H, 2×OMe).

Workup

  1. customquenched with saturated ammonium chloride solution
  2. additiondiluted with ethylacetate (20 mL)
  3. customThe organic layer was separated
  4. dry with materialdried over magnesium sulfate
  5. distillationthe solvent distilled
  6. customto afford the crude material which
  7. customwas purified over silica gel column (eluent—Hexane: diethyl-ether 1:1 to 0:100)

Sources & evidence

ORD record
ord-acb3ed5dc8f547b994bb5f80e333c446
Source dataset
uspto-grants-2012_06
Patent number
US08198466B2

Reaction notes

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