Triethylamine → 2-cyclopropyl-6-(3,5-difluorophenyl)-7-[(3S)-3-(dimethylamino)pyrrolidin-1-yl]-5-methyl-1,3-benzoxazole-4-carbonitrile

HRID 17452Notes

Reaction equation

HRID 17452 reaction equation
[CH:1]1([C:4]2[O:5][C:6]3[C:7](=[C:9]([C:23]#[N:24])[C:10]([CH3:22])=[C:11]([C:14]4[CH:19]=[C:18]([F:20])[CH:17]=[C:16]([F:21])[CH:15]=4)[C:12]=3F)[N:8]=2)[CH2:3][CH2:2]1.C(N(CC)CC)C.[CH3:32][N:33]([CH3:39])[C@H:34]1[CH2:38][CH2:37][NH:36][CH2:35]1.C(=O)([O-])O.[Na+]>CS(C)=O.C(OCC)(=O)C>[CH:1]1([C:4]2[O:5][C:6]3[C:7](=[C:9]([C:23]#[N:24])[C:10]([CH3:22])=[C:11]([C:14]4[CH:19]=[C:18]([F:20])[CH:17]=[C:16]([F:21])[CH:15]=4)[C:12]=3[N:36]3[CH2:37][CH2:38][C@H:34]([N:33]([CH3:39])[CH3:32])[CH2:35]3)[N:8]=2)[CH2:2][CH2:3]1

Participants

7

Reactant 4

HCID 8471TriethylamineHCID 516892Sodium BicarbonateHCID 7019156(3S)-(-)-3-(Dimethylamino)pyrrolidineHCID 685854282-Cyclopropyl-6-(3,5-difluorophenyl)-7-fluoro-5-methyl-1,3-benzoxazole-4-carbonitrile

Product 1

HCID 685848392-cyclopropyl-6-(3,5-difluorophenyl)-7-[(3S)-3-(dimethylamino)pyrrolidin-1-yl]-5-methyl-1,3-benzoxazole-4-carbonitrileYield 16%

Reagents, catalysts & solvents 2

HCID 679Dimethyl SulfoxideSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
90 °C

Procedure

2-Cyclopropyl-6-(3,5-difluorophenyl)-7-fluoro-5-methyl-1,3-benzoxazole-4-carbonitrile (I-176) (including impurities, estimated as 0.68 mmol) was dissolved in dimethyl sulfoxide (5 ml), then at room temperature, triethylamine (142 μl, 1.02 mmol) and (3S)-3-(dimethylamino)pyrrolidine (112 μl, 0.88 mmol) were added, the solution was stirred under nitrogen atmosphere at 90° C. for 15 hours. After cooling to room temperature, the reaction liquid was fractionated with ethyl acetate and an aqueous saturated sodium hydrogencarbonate solution. The aqueous layer was further extracted twice with ethyl acetate. The organic layers were combined, washed with saturated brine, and dried over anhydrous sodium sulfate. The insoluble matter was separated by filtration, then the solvent was evaporated away, and the resulting residue was purified by preparative TLC (eluent, chloroform:methanol=96:4) to obtain a roughly-purified product (211 mg, 74% for 2 steps) as a white solid. This was recrystallized from ethyl acetate and diisopropyl ether to obtain the entitled compound (46 mg) as a white solid.

Workup

  1. temperatureAfter cooling to room temperature
  2. customthe reaction liquid
  3. extractionThe aqueous layer was further extracted twice with ethyl acetate
  4. washwashed with saturated brine
  5. dry with materialdried over anhydrous sodium sulfate
  6. customThe insoluble matter was separated by filtration
  7. customthe solvent was evaporated away
  8. customthe resulting residue was purified by preparative TLC (eluent, chloroform:methanol=96:4)
  9. customto obtain a roughly-purified product (211 mg, 74% for 2 steps) as a white solid
  10. customThis was recrystallized from ethyl acetate and diisopropyl ether

Sources & evidence

ORD record
ord-10b35e463ed443d2b0cd50bb67c59fcc
Source dataset
uspto-grants-2010_06
Patent number
US07737166B2

Reaction notes

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