Valproic Acid → 4-Hydroxybutyl 2-propylpentanoate
Reaction equation
[CH2:1]([CH:4]([CH2:8][CH2:9][CH3:10])[C:5]([OH:7])=[O:6])[CH2:2][CH3:3].[CH2:11](O)[CH2:12][CH2:13][CH2:14][OH:15]>CS(O)(=O)=O.C1(C)C=CC=CC=1>[CH2:1]([CH:4]([CH2:8][CH2:9][CH3:10])[C:5]([O:7][CH2:11][CH2:12][CH2:13][CH2:14][OH:15])=[O:6])[CH2:2][CH3:3]Participants
5
Reactant 2
Product 1
Reagents, catalysts & solvents 2
Procedure
2-propylpentanoic acid (40.16 g, 278.5 mmol) was mixed with butane-1-4-diol (114.65 g, 1272.2 mmol) and methyl-sulfonic acid (5 drops) in toluene (3500 ml) and the mixture was heated under reflux using a Dean Stark trap for 12 h. After that, toluene was removed under reduced pressure and the crude mixture was dissolved in chloroform (200 ml) and extracted with water (pH 5, 3×200 ml). The combined organic layers were dried over sodium sulfate and the volatiles were removed under reduced pressure giving a clear oil (99%).