3-Methylpyridine → Ethyl (2S,5R)-6-(benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxylate

HRID 870507Notes

Reaction equation

HRID 870507 reaction equation
N1C=CC=C(C)C=1.C(O)(=O)[C:9](O)=[O:10].[CH2:14]([O:21][NH:22][C@H:23]1[CH2:28][NH:27][C@H:26]([C:29]([O:31][CH2:32][CH3:33])=[O:30])[CH2:25][CH2:24]1)[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1.ClC(Cl)(OC(=O)OC(Cl)(Cl)Cl)Cl.C(=O)(O)[O-].[Na+]>ClCCl.O>[CH2:32]([O:31][C:29]([C@@H:26]1[CH2:25][CH2:24][C@@H:23]2[CH2:28][N:27]1[C:9](=[O:10])[N:22]2[O:21][CH2:14][C:15]1[CH:16]=[CH:17][CH:18]=[CH:19][CH:20]=1)=[O:30])[CH3:33]

Participants

7

Reactant 4

HCID 79703-MethylpyridineHCID 94429TriphosgeneHCID 516892Sodium BicarbonateHCID 86675004Ethyl (2S,5R)-5-((benzyloxy)amino)piperidine-2-carboxylate oxalate

Product 1

HCID 72204974Ethyl (2S,5R)-6-(benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxylate

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6344DichloromethaneSolvent3×

Conditions

Temperature
0 °C

Procedure

3-picoline (52.6 ml, 543 mmol, 4 eq) was added to a slurry of ethyl (2S,5R)-5-[(benzyloxy)amino]piperidine-2-carboxylate ethanedioate (1:1) (50 g, 136 mmol, 1 eq) in dichloromethane (1000 ml) at 0° C., followed by a solution of triphosgene (36.4 g, 122.4 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 (28.6 g, 340 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 ethyl ester as a solution in dichloromethane (solution yield: 35 g, 116 mmol, 85%). Acetonitrile was added and the solution was concentrated in vacuo to give (2S,5R)-6-benzyloxy-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carboxylic acid ethyl ester as a solution in acetonitrile. This solution was diluted with acetonitrile to 700 ml. To this was added ammonium carbamate (11.3 g, 145 mmol, 1.25 eq) and Novozyme 435 (35 g, immobilized Candida antarctica lipase B). The mixture was stirred at 40° C. until the reaction was deemed to be complete. The reaction mixture was filtered and concentrated in vacuo. The solution was diluted with dichloromethane, washed with aqueous ammonium chloride, and concentrated in vacuo. Chlorobutane was added and the solution was concentrated in vacuo. The precipitate was isolated by filtration, washed with chlorobutane and dried to give 2S,5R)-6-(benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxamide as a white solid (24.3 g, 88 mmol, 65% from ethyl (2S,5R)-5-[(benzyloxy)amino]piperidine-2-carboxylate ethanedioate).

Workup

  1. customthe layers were separated
  2. extractionThe aqueous layer was extracted with dichloromethane (100 ml)
  3. washthe combined organic layers were washed with water
  4. concentrationThe organic layer was concentrated in vacuo

Sources & evidence

ORD record
ord-27b1163bd4f047d29cb31ea5d775f825
Source dataset
uspto-grants-2015_03
Patent number
US08969566B2

Reaction notes

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