Reaktion #160685

Reaktionsgleichung

3-picoline

benzyl (2S,5R)-5-[(benzyloxy)amino]piperidine-2-carboxylate ethanedioate

sodium bicarbonate

triphosgene

→

(2S,5R)-6-benzyloxy-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carboxylic acid benzyl ester

Lösungsmittel

dichloromethane

dichloromethane

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigethe layers were separated
2. 2
   ExtraktionThe aqueous layer was extracted with dichloromethane (100 ml)
3. 3
   Waschenthe combined organic layers were washed with water
4. 4
   EinengenThe organic layer was concentrated in vacuo

Vorschrift

3-picoline (45 ml, 464, 4 eq) was added to a slurry of benzyl (2S,5R)-5-[(benzyloxy)amino]piperidine-2-carboxylate ethanedioate (50 g, 116 mmol, 1 eq) in dichloromethane (1000 ml) at 0° C., followed by a solution of triphosgene (31.0 g, 104.4 mmol, 0.9 eq) in dichloromethane (200 ml). The mixture was stirred at 0° C. until the reaction was deemed to be complete. The reaction was quenched with a solution of sodium bicarbonate (24.4 g, 290 mmol, 2.5 eq) in water (300 ml), and the layers were separated. The aqueous layer was extracted with dichloromethane (100 ml) and the combined organic layers were washed with water. The organic layer was concentrated in vacuo to give (2S,5R)-6-benzyloxy-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carboxylic acid benzyl ester as a solution in dichloromethane.

Quelle