3-Hydroxyisovaleric acid → Methyl 3-hydroxy-3-methylbutanoate

In 50 ml of 7 wt. % hydrochloric acid methanol solution was dissolved 1.18 g of β-hydroxyisovaleric acid, and an reaction was allowed to proceed at room temperature overnight. The solvent was removed from the solution as reacted by distillation under a reduced pressure to obtain 1.30 g of crude methyl β-hydroxyisovalerate. The crude methyl β-hydroxyisovalerate was dissolved in diethyl ether, and 0.91 g of 3,4-dihydro-2H-pyran and a catalytic amount of p-toluenesulfonic acid were added thereto. Stirring was continued at room temperature overnight for reaction. The resultant reaction mixture was washed with a saturated aqueous solution of sodium hydrogencarbonate and then with water and dried over magnesium sulfate. The solvent was removed from the dried reaction mixture by distillation under a reduced pressure to obtain 1.98 g of crude methyl β-dihydropyranyloxyisovalerate.

1. customThe solvent was removed from the solution
2. customas reacted by distillation under a reduced pressure

ORD-Eintrag

ord-5c480e0b8a754195a1ecb4a2cbff6a4a

Quelldatensatz

uspto-grants-1996_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05480580