Reaktion #2146747

Reaktionsgleichung

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

trichloroisocyanuric acid

TEMPO

→

(4R,5R)-5-(2,4-Dichlorobenzyloxymethyl)-4-(2,4-dichlorobenzyloxy)-2-methoxy-dihydrofuran-3-one

Lösungsmittel

CH2Cl2

Reaktionsbedingungen

Aufarbeitung

1. 1
   Filtrationfiltered
2. 2
   SonstigeThe solvent is evaporated
3. 3
   workup.ADDITIONtoluene (100 mL) is added
4. 4
   WaschenThe organic phase is washed with sat. NaHCO3 solution (50 mL) and HCl aq. solution (1N, 50 mL)
5. 5
   TrocknenThe organic layers are dried (MgSO4)
6. 6
   Filtrationfiltered
7. 7
   Einengenconcentrated

Vorschrift

To a solution of (3R,4S,5R)-5-(2,4-Dichlorobenzyloxymethyl)-4-(2,4-dichlorobenzyloxy)-2-methoxy-tetrahydrofuran-3-ol (9.20 g, 19.08 mmol) in anhydrous CH2Cl2 (70 mL) and trichloroisocyanuric acid (4.88 g, 21 mmol) in an ice bath is added TEMPO (160 mg, 0.95 mmol). The reaction mixture changes to a yellow suspension and is stirred at 20° C. for 1 h. The reaction is determined to be complete by HPLC and filtered. The solvent is evaporated and toluene (100 mL) is added. The organic phase is washed with sat. NaHCO3 solution (50 mL) and HCl aq. solution (1N, 50 mL). The organic layers are dried (MgSO4), filtered and concentrated to give (4R,5R)-5-(2,4-Dichlorobenzyloxymethyl)-4-(2,4-dichlorobenzyloxy)-2-methoxy-dihydrofuran-3-one as light green oil which is directly used for the next step.

Quelle