Dicyclohexylcarbodiimide → 2,4-Dimethyl-4-isopropyl-2-oxazolin-5-one

HRID 981436Notes

Reaction equation

HRID 981436 reaction equation
[C:1]([NH:4][C:5]([CH3:12])([CH:9]([CH3:11])[CH3:10])[C:6]([OH:8])=[O:7])(=O)[CH3:2].C1(N=C=NC2CCCCC2)CCCCC1>C1COCC1>[CH3:2][C:1]1[O:7][C:6](=[O:8])[C:5]([CH3:12])([CH:9]([CH3:11])[CH3:10])[N:4]=1

Participants

4

Reactant 2

HCID 10868DicyclohexylcarbodiimideHCID 2338052-Acetamido-2,3-dimethylbutanoic acid

Product 1

HCID 146957652,4-Dimethyl-4-isopropyl-2-oxazolin-5-one

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
25 °C

Procedure

2-Acetamido-2,3-dimethylbutyric acid (16 g) is dissolved in THF (200 mL) and dicyclohexylcarbodiimide (DCC, 21.0 g) is added. The mixture is allowed to stir for 16 hours at 25° C. At the end of this time the mixture is filtered and evaporated to dryness. The residue is dissolved in CH2Cl2 (10 mL) and filtered again. Evaporation of the filtrate gives the crude product which is purified by distillation at 0.65 mmHg, having bp 50° C.

Workup

  1. filtrationAt the end of this time the mixture is filtered
  2. customevaporated to dryness
  3. dissolutionThe residue is dissolved in CH2Cl2 (10 mL)
  4. filtrationfiltered again
  5. customEvaporation of the filtrate

Sources & evidence

ORD record
ord-9b49f7beb86d42ccb7cc40b50b316e68
Source dataset
uspto-grants-1991_02
Patent number
US04992094

Reaction notes

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