Réaction #6751

Équation de réaction

4-[(4-ethylthiophenyl)methyl]-1,2-dihydro-5-methyl-3H-pyrazol-3-one

acetobromo-α-D-glucose

→

4-[(4-ethylthiophenyl)methyl]-5-methyl-3-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyloxy)-1H-pyrazole

Rendement 37.6%

Solvants

tetrahydrofuran

Conditions de réaction

Traitement

1. 1
   Autreat 60° C.
2. 2
   Autreovernight
3. 3
   AutreThe reaction mixture was purified by column chromatography on aminopropyl silica gel (eluent: tetrahydrofuran) and further column chromatography on silica gel (eluent: hexane/ethyl acetate=1/3)

Mode opératoire

To a suspension of 4-[(4-ethylthiophenyl)methyl]-1,2-dihydro-5-methyl-3H-pyrazol-3-one (1.6 g) and acetobromo-α-D-glucose (2.9 g) in tetrahydrofuran (30 mL) was added silver carbonate (2.1 g), and the mixture was stirred under shading the light at 60° C. overnight. The reaction mixture was purified by column chromatography on aminopropyl silica gel (eluent: tetrahydrofuran) and further column chromatography on silica gel (eluent: hexane/ethyl acetate=1/3) to give 4-[(4-ethylthiophenyl)methyl]-5-methyl-3-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyloxy)-1H-pyrazole (1.4 g).

Source