Hydrochloric Acid → 4-[[4-(6-methylpyridin-3-yl)-2,2-dimethyl-(2H)-thiochromen-6-yl]-ethynyl]-benzoic acid

HRID 619640Notes

Reaction equation

HRID 619640 reaction equation
[CH3:1][C:2]1[N:7]=[CH:6][C:5]([C:8]2[C:17]3[C:12](=[CH:13][CH:14]=[C:15]([C:18]#[C:19][C:20]4[CH:30]=[CH:29][C:23]([C:24]([O:26]CC)=[O:25])=[CH:22][CH:21]=4)[CH:16]=3)[S:11][C:10]([CH3:32])([CH3:31])[CH:9]=2)=[CH:4][CH:3]=1.[OH-].[Na+].Cl>C1COCC1.CCO>[CH3:1][C:2]1[N:7]=[CH:6][C:5]([C:8]2[C:17]3[C:12](=[CH:13][CH:14]=[C:15]([C:18]#[C:19][C:20]4[CH:21]=[CH:22][C:23]([C:24]([OH:26])=[O:25])=[CH:29][CH:30]=4)[CH:16]=3)[S:11][C:10]([CH3:32])([CH3:31])[CH:9]=2)=[CH:4][CH:3]=1

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 14798Sodium HydroxideHCID 21846679ethyl 4-[[4-(6-methylpyridin-3-yl)-2,2-dimethyl-(2H)-thiochromen-6-yl]-ethynyl]-benzoate2×

Product 1

HCID 98229074-[[4-(6-methylpyridin-3-yl)-2,2-dimethyl-(2H)-thiochromen-6-yl]-ethynyl]-benzoic acidYield 92%

Reagents, catalysts & solvents 2

HCID 702EthanolSolventHCID 8028TetrahydrofuranSolvent

Conditions

Temperature
35 °C

Procedure

To a solution of ethyl 4-[[4-(6-methylpyridin-3-yl)-2,2-dimethyl-(2H)-thiochromen-6-yl]-ethynyl]-benzoate (Compound 233, 70.0 mg, 0.159 mmol) in 3.0 mL THF and 3.0 mL EtOH was added NaOH (120.0 mg, 3.0 mmol, 3.0 mL of a 1M aqueous solution). The resulting solution was stirred overnight at 35° C. Upon cooling to room temperature, the reaction mixture was acidified with 10% aqueous HCl and extracted with EtOAc. The combined organic layers were washed with H2O, saturated aqueous NaCl, and dried (Na2SO4) before removing the solvent under reduced pressure. The residual solid was recrystallized from acetone to give 60.0 mg (92%) of the title compound as a colorless solid. 1H NMR (300 MHz, d6 -acetone) δ: 8.36 (1H, d, J=2.1 Hz), 7.91 (2H, d, J=8.3 Hz), 7.60 (2H, d, J=8.3 Hz), 7.56 (1H, dd, J=2.1 8.0 Hz), 7.45 (2H, m), 7.31 (1H, d, J=8.0 Hz), 7.06 (1H, s), 6.06 (1H, s), 2.51 (3H, s), 1.44 (6H, s).

Workup

  1. temperatureUpon cooling to room temperature
  2. extractionextracted with EtOAc
  3. washThe combined organic layers were washed with H2O, saturated aqueous NaCl
  4. dry with materialdried (Na2SO4)
  5. custombefore removing the solvent under reduced pressure
  6. customThe residual solid was recrystallized from acetone

Sources & evidence

ORD record
ord-e5f0526873e740d2950b44ea2ffb1b38
Source dataset
uspto-grants-1999_09
Patent number
US05958954

Reaction notes

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