Reaktion #82146

Reaktionsgleichung

Water

butyllithium

morphine

TBDMS chloride

→

product

Ausbeute 56.1%

3-tert-butyldimethylsilylmorphine

Ausbeute 56.1%

Lösungsmittel

CH2Cl2 MeOH

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.WAITThe mixture was left
2. 2
   Extraktionwas extracted with dichloromethane several times
3. 3
   Waschenwashed with brine
4. 4
   Trocknendried over Na2SO4
5. 5
   Filtrationfiltered
6. 6
   Sonstigethe solvent removed in vacuo
7. 7
   Sonstigeto leave an off-white film

Vorschrift

To a stirred suspension of anhydrous morphine (7.01 mmol) at -78° C. in anhydrous THF (15 ml) was added 1.6M butyllithium (4.8 ml, 0.492 g, 7.68 mmol) over 8 minutes. 42 minutes later, a solution of TBDMS chloride (1.27 g, 8.43 mmol) in anhydrous THF (10 ml) was added over 10 minutes. The mixture was left to warm up gradually to room temperature overnight by which time all the material had gone into solution. Water was then added to the mixture which was extracted with dichloromethane several times. The organic extracts were combined, washed with brine, dried over Na2SO4, filtered and the solvent removed in vacuo to leave an off-white film. Chromatography over silica using CH2Cl2 /MeOH (5:1) as eluent afforded the product as a white solid (1.58 g, 56%). Recrystallization from Et2O/petrol (boiling point 40°-60°) gave white crystalline needles (1.37 g), m.p.=120°-122° C.

Quelle