Potassium Carbonate → Tert-butyl 7-(3,3-dimethyl-2-oxobutyl)-9-oxa-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate

HRID 898791Notes

Reaction equation

HRID 898791 reaction equation
Cl.[CH:2]12[O:10][CH:6]([CH2:7][NH:8][CH2:9]1)[CH2:5][N:4]([C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])[CH2:3]2.C([O-])([O-])=O.[K+].[K+].Cl[CH2:25][C:26](=[O:31])[C:27]([CH3:30])([CH3:29])[CH3:28]>CC#N>[CH3:28][C:27]([CH3:30])([CH3:29])[C:26](=[O:31])[CH2:25][N:8]1[CH2:7][CH:6]2[O:10][CH:2]([CH2:3][N:4]([C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])[CH2:5]2)[CH2:9]1

Participants

5

Reactant 3

HCID 11430Potassium CarbonateHCID 835721-ChloropinacoloneHCID 18540411Tert-butyl 9-oxa-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate hydrochloride

Product 1

HCID 18540396Tert-butyl 7-(3,3-dimethyl-2-oxobutyl)-9-oxa-3,7-diazabicyclo[3.3.1]nonane-3-carboxylateYield 85.5%

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Conditions

Temperature
40 °C

Procedure

A mixture of tert-butyl 9-oxa-3,7-diazabicyclo[3.3.1]nonane-3-carboxylate hydrochloride (Preparation A; 0.26 g, 1.0 mmol) and K2CO3 (1.45 g, 10.5 mmol) in MeCN (8 mL) was treated with 1-chloropinacolone (0.216 g, 1.6 mmol), and the mixture stirred at 40° C. overnight. The following morning, the temperature was raised to 50° C. for 4 h before the solids were filtered off from the mixture and the filtrate concentrated in vacuo. The crude product was dissolved in DCM and the solution was added to an ion-exchange solid phase extraction plug (10 g CBA (carboxylic acid on silica support)). After 1 h, the plug was washed with DCM (15 mL), after which the product was finally eluted with dichloromethane:MeOH:TEA (90:5:5). The solvents were evaporated to give 0.276 g (85.5%) of the sub-title compound.

Workup

  1. customPreparation A
  2. temperatureThe following morning, the temperature was raised to 50° C. for 4 h before the solids
  3. filtrationwere filtered off from the mixture
  4. concentrationthe filtrate concentrated in vacuo
  5. dissolutionThe crude product was dissolved in DCM
  6. additionthe solution was added to an ion-exchange solid phase extraction plug (10 g CBA (carboxylic acid on silica support))
  7. waitAfter 1 h
  8. washthe plug was washed with DCM (15 mL)
  9. washafter which the product was finally eluted with dichloromethane:MeOH:TEA (90:5:5)
  10. customThe solvents were evaporated

Sources & evidence

ORD record
ord-d09efe7ce2654d44ba9bcd56e0b01d37
Source dataset
uspto-grants-2008_04
Patent number
US07351821B2

Reaction notes

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