Potassium Hydroxide → 2-(Ethoxycarbonyl)-4-methylpentanoic acid

HRID 1888351Notes

Reaction equation

HRID 1888351 reaction equation
C[O:2][C:3](=[O:14])[CH:4]([CH2:10][CH:11]([CH3:13])[CH3:12])[C:5]([O:7][CH2:8][CH3:9])=[O:6].[OH-].[K+]>C(O)C>[CH2:8]([O:7][C:5](=[O:6])[CH:4]([CH2:10][CH:11]([CH3:13])[CH3:12])[C:3]([OH:14])=[O:2])[CH3:9]

Participants

4

Reactant 2

HCID 14797Potassium HydroxideHCID 249734591-Ethyl 3-methyl 2-isobutylmalonate

Product 1

HCID 101039412-(Ethoxycarbonyl)-4-methylpentanoic acidYield 92.7%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

2-Isobutylmalonic acid ethyl ester methyl ester (50.0 g, 231 mmol, 1.0 eq) was dissolved into 280 ml ethanol. To this solution was added solid KOH (12.7 g, 226 mmol, 0.98 eq) and the mixture was stirred at room temperature for 16 hours. The mixture was then concentrated under reduced pressure and redissolved in 500 mL water. The solution was washed 2×250 ml diethyl ether, acidified to pH 2 with 6N HCl, and extracted with 2×250 mL diethyl ether. The organic was dried over MgSO4, and concentrated to yield intermediate (3a) (40.3 g). 1H NMR (DMSO) δ (ppm): 1.0 (dd, 6H), 1.2 (t, 1H), 1.3 (t, 3H), 1.5-1.7 (m, 1H), 1.8 (t, 2H), 3.5 (m, 2H), 4.2 (quart, 2H).

Workup

  1. concentrationThe mixture was then concentrated under reduced pressure
  2. dissolutionredissolved in 500 mL water
  3. washThe solution was washed 2×250 ml diethyl ether
  4. extractionextracted with 2×250 mL diethyl ether
  5. dry with materialThe organic was dried over MgSO4
  6. concentrationconcentrated

Sources & evidence

ORD record
ord-7913383aeb6c48318274157d252b4859
Source dataset
uspto-grants-2013_08
Patent number
US08501798B2

Reaction notes

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