Hydrochloric Acid → 2-Methyl-2-(3-methyl-butane-1-sulfonyl)-propionic acid

HRID 1809373Notes

Reaction equation

HRID 1809373 reaction equation
C([O:3][C:4](=[O:18])[C:5]([CH3:17])([S:7]([CH2:10][CH2:11][CH2:12][C:13](F)(F)F)(=[O:9])=[O:8])[CH3:6])C.[CH3:19][Si](C)(C)[O-].[K+].Cl>C1COCC1>[CH3:17][C:5]([S:7]([CH2:10][CH2:11][CH:12]([CH3:13])[CH3:19])(=[O:8])=[O:9])([CH3:6])[C:4]([OH:3])=[O:18]

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 23668039Potassium trimethylsilanolateHCID 592532852-Methyl-2-(4,4,4-trifluoro-butane-1-sulfonyl)-propionic acid ethyl ester

Product 1

HCID 592532112-Methyl-2-(3-methyl-butane-1-sulfonyl)-propionic acidYield 109.8%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of 170 g (585.6 mmol) of 2-methyl-2-(4,4,4-trifluoro-butane-1-sulfonyl)-propionic acid ethyl ester in THF (3.4 L) are added 225.4 g (1756.8 mmol) of potassium trimethylsilanolate in portions over 0.5 h. The reaction is stirred at room temperature for 18 h. The reaction mixture is acidified with 2M aqueous HCl solution (2 L) to pH 2 and extracted with DCM (2×2 L). The combined organic extracts are dried (Na2SO4) and filtered. The filtrate is concentrated under reduced pressure to afford 143 g of 2-methyl-2-(3-methyl-butane-1-sulfonyl)-propionic acid as yellow solids. Yield: 93%; ES-MS: m/z 261 [M−H]. 1H NMR (500 MHz, CHLOROFORM-d) δ ppm 1.71 (6H, s), 2.18-2.28 (2H, m), 2.30-2.42 (2H, m), 3.38 (2H, t, J=7.48 Hz), 6.96 (1H, br. s.)

Workup

  1. extractionextracted with DCM (2×2 L)
  2. dry with materialThe combined organic extracts are dried (Na2SO4)
  3. filtrationfiltered
  4. concentrationThe filtrate is concentrated under reduced pressure

Sources & evidence

ORD record
ord-0299a92e4d3e48d4811d5ee76fffdb08
Source dataset
uspto-grants-2013_01
Patent number
US08362039B2

Reaction notes

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