Reaktion #7492

Reaktionsgleichung

Citric acid monohydrate

water

1-(cyclopropylmethyl)-3-(β-D-glucopyranosyloxy)-4-[(4-isopropoxyphenyl)methyl]-5-methyl-1H-pyrazole

propionyl chloride

→

1-(cyclopropylmethyl)-4-[(4-isopropoxyphenyl)methyl]-5-methyl-3-(6-O-propionyl-β-D-glucopyranosyloxy)-1H-pyrazole

Lösungsmittel

2,4,6-trimethylpyridine

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.DISTILLATIONthe mixture was purified by solid phase extraction on ODS (washing solvent: distilled water, eluent: methanol)

Vorschrift

To a solution of 1-(cyclopropylmethyl)-3-(β-D-glucopyranosyloxy)-4-[(4-isopropoxyphenyl)methyl]-5-methyl-1H-pyrazole (0.40 g) in 2,4,6-trimethylpyridine (1.5 mL) was added propionyl chloride (0.0088 g) at 0° C., and the mixture was stirred for 3 hours. Citric acid monohydrate (3.3 g) and water were added to the reaction mixture, and the mixture was purified by solid phase extraction on ODS (washing solvent: distilled water, eluent: methanol), and successively by column chromatography on silica gel (eluent: dichloromethane/methanol=10/1) to give 1-(cyclopropylmethyl)-4-[(4-isopropoxyphenyl)methyl]-5-methyl-3-(6-O-propionyl-β-D-glucopyranosyloxy)-1H-pyrazole (0.20 g).

Quelle