Реакция #160685

Уравнение реакции

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

Растворители

dichloromethane

dichloromethane

water

Условия реакции

Обработка

1. 1
   Другоеthe layers were separated
2. 2
   ЭкстракцияThe aqueous layer was extracted with dichloromethane (100 ml)
3. 3
   Промывкаthe combined organic layers were washed with water
4. 4
   КонцентрированиеThe organic layer was concentrated in vacuo

Методика

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.

Источник