tert-Butyl 3-oxo-8-azabicyclo(3.2.1)octane-8-carboxylate → tert-Butyl 3-hydroxy-8-azabicyclo(3.2.1)octane-8-carboxylate

HRID 1518550Notes

Reaction equation

HRID 1518550 reaction equation
[O:1]=[C:2]1[CH2:8][CH:7]2[N:9]([C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])[CH:4]([CH2:5][CH2:6]2)[CH2:3]1.[BH4-].[Na+]>C(O)C.ClCCl>[OH:1][CH:2]1[CH2:3][CH:4]2[N:9]([C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])[CH:7]([CH2:6][CH2:5]2)[CH2:8]1

Participants

5

Reactant 2

HCID 2794767tert-Butyl 3-oxo-8-azabicyclo(3.2.1)octane-8-carboxylateHCID 4311764Sodium borohydride

Product 1

HCID 21187725tert-Butyl 3-hydroxy-8-azabicyclo(3.2.1)octane-8-carboxylateYield 93.6%

Reagents, catalysts & solvents 2

HCID 702EthanolSolventHCID 6344DichloromethaneSolvent

Procedure

3-Oxo-8-aza-bicyclo[3.2.1]octane-8-carboxylic acid, tert-butyl ester (8 g, 35.5 mmol) was dissolved in 100 mL of ethanol. Sodium borohydride (2 g, 53.5 mmol) was added to the solution portionwise at room temperature. After stirring for 3 hours, the reaction was evaporated in vacuo to give clear viscous oil. The oil was dissolved in dichloromethane, washed with water and brine, dried over anhydrous sodium sulfate, filtered, and evaporated to afford 7.55 g of 3-hydroxy-8-aza-bicyclo[3.2.1]octane-8-carboxylic acid, tert-butyl ester as a white crystalline solid; 1H NMR (300 MHz, DMSO-d6): 4.23 (dd, J=2.7, 4.6 Hz, 1 H), 4.18-4.06 (m, 2 H), 2.17-2.06 (m, 1 H), 1.99-1.91 (m, 3 H), 1.72-1.50 (m, 5H), 1.47 (s, 9H).

Workup

  1. customthe reaction was evaporated in vacuo
  2. customto give clear viscous oil
  3. washwashed with water and brine
  4. dry with materialdried over anhydrous sodium sulfate
  5. filtrationfiltered
  6. customevaporated

Sources & evidence

ORD record
ord-6f07a552b1dc44a1afb6c35b5b406ca1
Source dataset
uspto-grants-2012_07
Patent number
US08232406B2

Reaction notes

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