Acetic Acid → 2-(2-Nitro-ethyl)-5-p-tolyloxy-thiophene

HRID 640201Notes

Reaction equation

HRID 640201 reaction equation
CS(C)=O.[N+:5](/[CH:8]=[CH:9]/[C:10]1[S:11][C:12]([O:15][C:16]2[CH:21]=[CH:20][C:19]([CH3:22])=[CH:18][CH:17]=2)=[CH:13][CH:14]=1)([O-:7])=[O:6].C(O)(=O)C.[BH4-].[Na+]>O>[N+:5]([CH2:8][CH2:9][C:10]1[S:11][C:12]([O:15][C:16]2[CH:21]=[CH:20][C:19]([CH3:22])=[CH:18][CH:17]=2)=[CH:13][CH:14]=1)([O-:7])=[O:6]

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 679Dimethyl SulfoxideHCID 4311764Sodium borohydrideHCID 592554462-((E)-2-Nitro-vinyl)-5-p-tolyloxy-thiophene

Product 1

HCID 592553422-(2-Nitro-ethyl)-5-p-tolyloxy-thiopheneYield 47.6%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

To a dimethyl sulfoxide (30.0 mL) solution of 2-((E)-2-nitro-vinyl)-5-p-tolyloxy-thiophene (2.50 g, 9.57 mmol) described in Manufacturing Example 48-1-3 and acetic acid (2.50 mL) was added sodium borohydride (610 mg, 20.6 mmol) at room temperature while cooling appropriately under nitrogen atmosphere, which was stirred for 30 minutes at room temperature. Water was then added dropwise at room temperature while cooling appropriately. The reaction mixture was extracted with ethyl acetate, and the organic layer was washed with water and saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, and filtered. The filtrate was concentrated under a reduced pressure and the residue was purified by NH silica gel column chromatography (ethyl acetate:heptane=1:4) to obtain the title compound (1.20 g, 47.6%).

Workup

  1. temperaturewhile cooling appropriately under nitrogen atmosphere
  2. temperaturewhile cooling appropriately
  3. extractionThe reaction mixture was extracted with ethyl acetate
  4. washthe organic layer was washed with water and saturated aqueous sodium chloride
  5. dry with materialdried over anhydrous magnesium sulfate
  6. filtrationfiltered
  7. concentrationThe filtrate was concentrated under a reduced pressure
  8. customthe residue was purified by NH silica gel column chromatography (ethyl acetate:heptane=1:4)

Sources & evidence

ORD record
ord-b216c52bef9b40978601323364af8602
Source dataset
uspto-grants-2010_04
Patent number
US07691882B2

Reaction notes

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