3-(Bromomethyl)benzoic acid → 3-[2-Cyano-2-(3,4-dimethoxyphenyl)-2-[(4-methylphenyl)thio]ethyl]benzoic acid

HRID 863886Notes

Reaction equation

HRID 863886 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:11]([S:14][C:15]2[CH:20]=[CH:19][C:18]([CH3:21])=[CH:17][CH:16]=2)[C:12]#[N:13])[CH:6]=[CH:7][C:8]=1[O:9][CH3:10].C([Li])CCC.[C:27]([C:30]1[CH:31]=[C:32]([CH:35]=[CH:36][CH:37]=1)[CH2:33]Br)([OH:29])=[O:28]>O1CCCC1.CCCCCC>[C:12]([C:11]([C:5]1[CH:6]=[CH:7][C:8]([O:9][CH3:10])=[C:3]([O:2][CH3:1])[CH:4]=1)([S:14][C:15]1[CH:16]=[CH:17][C:18]([CH3:21])=[CH:19][CH:20]=1)[CH2:33][C:32]1[CH:31]=[C:30]([CH:37]=[CH:36][CH:35]=1)[C:27]([OH:29])=[O:28])#[N:13]

Participants

6

Reactant 3

HCID 2456503-(Bromomethyl)benzoic acidHCID 105421673,4-Dimethoxy-alpha[(4-methylphenyl)thio]benzeneacetonitrileHCID 178418339Butyllithium

Product 1

HCID 105988973-[2-Cyano-2-(3,4-dimethoxyphenyl)-2-[(4-methylphenyl)thio]ethyl]benzoic acidYield 85.1%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolvent2×HCID 8058HexaneSolvent

Conditions

Temperature
-78 °C

Procedure

To a cold (-78° C.) solution of 1.86 g of 3,4-dimethoxy-α-[(4-methylphenyl)thio]benzene acetonitrile in 15 mL of tetrahydrofuran is added drop-wise a solution of 2.9 mL of n-butyl lithium (2.2M) in hexane. This solution is stirred at -78° C. for 35 minutes. A solution of 0.67 g of m-carboxybenzyl bromide in 5 mL of anhydrous tetrahydrofuran is added drop-wise, stirred at -78° C. for 40 minutes and then at room temperature for 15 minutes. The mixture is quenched with water and extracted with ethyl acetate. The ethyl acetate extract is washed with brine, dried and filtered. The filtrate is evaporated in vacuo to yield a yellow oil. This oil is purified by flash chromatography using methylene chloride/methyl alcohol (95:5) to yield 1.15 g of the desired product as a yellow foam.

Workup

  1. stirringstirred at -78° C. for 40 minutes
  2. waitat room temperature for 15 minutes
  3. customThe mixture is quenched with water
  4. extractionextracted with ethyl acetate
  5. extractionThe ethyl acetate extract
  6. washis washed with brine
  7. customdried
  8. filtrationfiltered
  9. customThe filtrate is evaporated in vacuo
  10. customto yield a yellow oil
  11. customThis oil is purified by flash chromatography

Sources & evidence

ORD record
ord-6d675552b4554d3ead2d6907759ec5a8
Source dataset
uspto-grants-1996_10
Patent number
US05561141

Reaction notes

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