Reaktion #2146743

Reaktionsgleichung

(3R,4R,5R)-5-(2,4-dichloro-benzyloxymethyl)-4-(2,4-dichlorobenzyloxy)-2-methoxy-tetrahydrofuran-3-acetate

NaOMe

→

(3R,4S,5R)-5-(2,4-Dichlorobenzyloxymethyl)-4-(2,4-dichlorobenzyloxy)-2-methoxy-tetrahydrofuran-3-ol

Lösungsmittel

MeOH

MeOH

Reaktionsbedingungen

Aufarbeitung

1. 1
   EinengenThe reaction mixture is concentrated
2. 2
   workup.DISSOLUTIONdissolved in ethyl acetate (180 ml)
3. 3
   Waschenwashed with 1 N HCl solution and saturated brine
4. 4
   Trocknendried (anhyd Na2SO4)
5. 5
   Einengenconcentrated

Vorschrift

To a solution of (3R,4R,5R)-5-(2,4-dichloro-benzyloxymethyl)-4-(2,4-dichlorobenzyloxy)-2-methoxy-tetrahydrofuran-3-acetate I-1 (10 g, 19.1 mmol) in MeOH (150 ml) is added a solution of 30% NaOMe in MeOH (5.37 ml, 28.6 mmol, 1.5 equiv.) and the reaction is stirred at room temperature for 30 mins. The reaction mixture is concentrated and dissolved in ethyl acetate (180 ml), washed with 1 N HCl solution and saturated brine, dried (anhyd Na2SO4) and concentrated to give (3R,4S,5R)-5-(2,4-Dichlorobenzyloxymethyl)-4-(2,4-dichlorobenzyloxy)-2-methoxy-tetrahydrofuran-3-ol I-2 as yellowish oil. The obtained crude compound is used for the next step without further purification.

Quelle