Reaktion #159792

Reaktionsgleichung

(3R,4S,5S,6R)-2-[4-bromo-3-(2,3-dihydro-benzo[1,4]dioxin-6-ylmethyl)-phenyl]-6-hydroxymethyl-2-methoxy-tetrahydro-pyran-3,4,5-triol

triethylsilane

boron trifluoride

→

(3R,4R,5S,6R)-2-[4-bromo-3-(2,3-dihydro-benzo[1,4]dioxin-6-ylmethyl)-phenyl]-6-hydroxymethyl-tetrahydro-pyran-3,4,5-triol

Ausbeute 106.4%

Lösungsmittel

acetonitrile dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigethe reaction was quenched with saturated aqueous sodium bicarbonate (˜100 mL)
2. 2
   SonstigeThe organic layer was separated
3. 3
   Extraktionthe aqueous layer was extracted with ethyl acetate (3×150 mL)
4. 4
   Trocknendried over sodium sulfate
5. 5
   Einengenconcentrated

Vorschrift

To a stirred solution of (3R,4S,5S,6R)-2-[4-bromo-3-(2,3-dihydro-benzo[1,4]dioxin-6-ylmethyl)-phenyl]-6-hydroxymethyl-2-methoxy-tetrahydro-pyran-3,4,5-triol (28.4 g, 57.1 mmol) in acetonitrile-dichloromethane 1:1 (250 mL) was added triethylsilane (36.5 mL, 228.4 mmol) and boron trifluoride diethyletharate complex (14.1 mL, 114.2 mmol) at 10° C. After stirring for 4 h at 10° C., the reaction was quenched with saturated aqueous sodium bicarbonate (˜100 mL). The organic layer was separated, and the aqueous layer was extracted with ethyl acetate (3×150 mL). The organic layers were combined and dried over sodium sulfate, concentrated to furnish (3R,4R,5S,6R)-2-[4-bromo-3-(2,3-dihydro-benzo[1,4]dioxin-6-ylmethyl)-phenyl]-6-hydroxymethyl-tetrahydro-pyran-3,4,5-triol (28.4 g). Crude product was used for next reaction without purification.

Quelle