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

HRID 925140Notes

Reaction equation

HRID 925140 reaction equation
[CH2:1]([O:8][N:9]1[C:15](=[O:16])[N:14]2[CH2:17][C@H:10]1[CH2:11][CH2:12][C@H:13]2[C:18]([OH:20])=[O:19])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH2:21](O)[C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1.Cl.C(N=C=NCCCN(C)C)C>ClCCl>[CH2:1]([O:8][N:9]1[C:15](=[O:16])[N:14]2[CH2:17][C@H:10]1[CH2:11][CH2:12][C@H:13]2[C:18]([O:20][CH2:21][C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1)=[O:19])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

5

Reactant 3

HCID 244Benzyl AlcoholHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochlorideHCID 57389355(2S,5R)-6-(Benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxylic acid

Product 1

HCID 57389438(2S,5R)-6-benzyloxy-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carboxylic acid benzyl esterYield 33%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

94 mg (0.346 mmol) of (2S,5R)-6-(benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxylic acid was dissolved in dichloromethane (3.4 mL), and 70 μL (0.676 mmol) of benzylalcohol and 98 mg (0.511 mmol) of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride were added, followed by stifling at room temperature for 24 hours. The reaction mixture was concentrated under reduced pressure, and subsequently the residue was diluted with ethyl acetate and washed with water and then with saturated brine. The organic layer was dried over anhydrous magnesium sulfate, and the solvent was concentrated under reduced pressure. The resulting residue was applied to silica gel column chromatography (hexane/ethyl acetate=3/1) to afford 41.2 mg of the title compound (yield 33%). Enantiomeric excess: 99.8% ee (CHIRALPAK AD-H, 4.6×150 mm, hexane/ethanol=2/1, UV 210 nm, flow rate 1 mL/min., retention time 33.2 min.).

Workup

  1. concentrationThe reaction mixture was concentrated under reduced pressure
  2. additionsubsequently the residue was diluted with ethyl acetate
  3. washwashed with water
  4. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
  5. concentrationthe solvent was concentrated under reduced pressure

Sources & evidence

ORD record
ord-4d797eaf732b4d75881a713e05e78612
Source dataset
uspto-grants-2016_03
Patent number
US09284273B2

Reaction notes

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