Triethyloxonium tetrafluoroborate → [(S)-1-(7-Cyano-6-fluoro-1-pyridin-2-yl-1H-benzoimidazol-2-yl)ethyl]carbamic acid tert-butyl ester

HRID 243064Notes

Reaction equation

HRID 243064 reaction equation
[C:1]([O:5][C:6](=[O:13])[NH:7][C@H:8]([C:10](=O)[NH2:11])[CH3:9])([CH3:4])([CH3:3])[CH3:2].F[B-](F)(F)F.C([O+](CC)CC)C.N[C:27]1[C:28]([NH:36][C:37]2[CH:42]=[CH:41][CH:40]=[CH:39][N:38]=2)=[C:29]([C:32]([F:35])=[CH:33][CH:34]=1)[C:30]#[N:31]>C(Cl)Cl>[C:1]([O:5][C:6](=[O:13])[NH:7][C@H:8]([C:10]1[N:36]([C:37]2[CH:42]=[CH:41][CH:40]=[CH:39][N:38]=2)[C:28]2[C:29]([C:30]#[N:31])=[C:32]([F:35])[CH:33]=[CH:34][C:27]=2[N:11]=1)[CH3:9])([CH3:4])([CH3:3])[CH3:2]

Participants

5

Reactant 3

HCID 2723982Triethyloxonium tetrafluoroborateHCID 7015295Boc-Ala-NH2HCID 681581043-Amino-6-fluoro-2-(pyridin-2-ylamino)benzonitrile

Product 1

HCID 68157921[(S)-1-(7-Cyano-6-fluoro-1-pyridin-2-yl-1H-benzoimidazol-2-yl)ethyl]carbamic acid tert-butyl esterYield 54.7%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a suspension of ((S)-1-carbamoylethyl)carbamic acid tert-butyl ester (820 mg, 4.4 mmol) in DCM (7 mL) was added triethyloxonium tetrafluoroborate (877 mg, 4.6 mmol) and the reaction mixture stirred at RT for 2 h, during which the solids dissolved. The reaction mixture was concentrated in vacuo and the residue dissolved in ethanol (7 mL). 3-Amino-6-fluoro-2-(pyridin-2-ylamino)benzonitrile (620 mg, 2.7 mmol) was added and the reaction heated at 75° C. for 16 h. The reaction mixture was concentrated in vacuo, the residue dissolved in water and the product extracted with EtOAc (3×20 mL). The combined organic extracts were washed with brine, dried (MgSO4) and concentrated in vacuo. The resultant residue was subjected to flash chromatography (SiO2, eluting with 0-100% EtOAc in cyclohexane) to yield the title compound as a white solid (563 mg, 54%). LCMS (Method C): RT=3.20 min, [M+H]+=382.

Workup

  1. dissolutiondissolved
  2. concentrationThe reaction mixture was concentrated in vacuo
  3. dissolutionthe residue dissolved in ethanol (7 mL)
  4. temperaturethe reaction heated at 75° C. for 16 h
  5. concentrationThe reaction mixture was concentrated in vacuo
  6. dissolutionthe residue dissolved in water
  7. extractionthe product extracted with EtOAc (3×20 mL)
  8. washThe combined organic extracts were washed with brine
  9. dry with materialdried (MgSO4)
  10. concentrationconcentrated in vacuo
  11. washThe resultant residue was subjected to flash chromatography (SiO2, eluting with 0-100% EtOAc in cyclohexane)

Sources & evidence

ORD record
ord-aedc54a20f1c4ca4ab4ca73368a45e00
Source dataset
uspto-grants-2014_02
Patent number
US08653089B2

Reaction notes

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