Trimethylsilyl cyanide → 8,9-Dihydrofuro[3,2-c]pyrazolo[1,5-a]pyridin-1-ylacetonitrile

HRID 2389882Notes

Reaction equation

HRID 2389882 reaction equation
C[Si]([C:5]#[N:6])(C)C.[C:7]1([CH2:19]O)[CH:8]=[N:9][N:10]2[CH:15]=[CH:14][C:13]3[O:16][CH2:17][CH2:18][C:12]=3[C:11]=12>ClCCl.C(=O)([O-])O.[Na+]>[C:7]1([CH2:19][C:5]#[N:6])[CH:8]=[N:9][N:10]2[CH:15]=[CH:14][C:13]3[O:16][CH2:17][CH2:18][C:12]=3[C:11]=12

Participants

5

Reactant 2

HCID 82115Trimethylsilyl cyanideHCID 591793818,9-Dihydrofuro[3,2-c]pyrazolo[1,5-a]pyridin-1-ylmethanol

Product 1

HCID 591793778,9-Dihydrofuro[3,2-c]pyrazolo[1,5-a]pyridin-1-ylacetonitrileYield 42%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolvent2×HCID 516892Sodium BicarbonateSolvent

Procedure

To a solution of boron trifluoride diethyl ether complex (1.26 mL, 9.94 mmol) and trimethylsilyl cyanide (1.77 mL, 13.3 mmol) in dichloromethane (13 mL) was added a solution of 8,9-dihydrofuro[3,2-c]pyrazolo[1,5-a]pyridin-1-ylmethanol (630 mg, 3.31 mmol) in dichloromethane (39 mL) under ice-cooling and an argon atmosphere, and the mixture was stirred at room temperature for 30 min. The reaction solution was diluted with saturated aqueous sodium hydrogen carbonate solution, and the mixture was extracted with ethyl acetate. The extract was dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure and the residue was purified by silica gel column chromatography (ethyl acetate/hexane=10/90→40/60) to give the title compound (274 mg, yield 42%).

Workup

  1. temperaturecooling
  2. extractionthe mixture was extracted with ethyl acetate
  3. dry with materialThe extract was dried over anhydrous sodium sulfate
  4. customThe solvent was evaporated under reduced pressure
  5. customthe residue was purified by silica gel column chromatography (ethyl acetate/hexane=10/90→40/60)

Sources & evidence

ORD record
ord-ce2c374aff41485a856250562bfee595
Source dataset
uspto-grants-2012_09
Patent number
US08273761B2

Reaction notes

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