Valproic Acid → 3-Hydroxypropyl 2-propylpentanoate

Participants

Reaction Steps

2-propylpentanoic acid (10.0 g, 69.3 mmol) was mixed with propane-1-3-diol (42.1 g, 555.0 mmol) and methyl-sulfonic acid (5 drops) in toluene (200 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 dichloromethane (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 (14.0 g, 60.0 mmol, 99%).

Provenance & Evidence