Triethylamine → 2-Cyclopropyl-7-[(3S)-3-(methylamino)pyrrolidin-1-yl]-5-methyl-6-(2-methyl-1,3-thiazol-4-yl)-1,3-benzoxazole-4-carbonitrile

HRID 17340Notes

Reaction equation

HRID 17340 reaction equation
[CH:1]1([C:4]2[O:5][C:6]3[C:7](=[C:9]([C:21]#[N:22])[C:10]([CH3:20])=[C:11]([C:14]4[N:15]=[C:16]([CH3:19])[S:17][CH:18]=4)[C:12]=3F)[N:8]=2)[CH2:3][CH2:2]1.C(N(CC)CC)C.[CH3:30][NH:31][C@H:32]1[CH2:36][CH2:35][NH:34][CH2:33]1.C(OCC)(=O)C>CS(C)=O.O>[CH:1]1([C:4]2[O:5][C:6]3[C:7](=[C:9]([C:21]#[N:22])[C:10]([CH3:20])=[C:11]([C:14]4[N:15]=[C:16]([CH3:19])[S:17][CH:18]=4)[C:12]=3[N:34]3[CH2:35][CH2:36][C@H:32]([NH:31][CH3:30])[CH2:33]3)[N:8]=2)[CH2:3][CH2:2]1

Participants

7

Reactant 4

HCID 8471TriethylamineHCID 8857Ethyl AcetateHCID 10261057(3S)-(-)-3-(Methylamino)pyrrolidineHCID 685848052-Cyclopropyl-7-fluoro-5-methyl-6-(2-methyl-1,3-thiazol-4-yl)-1,3-benzoxazole-4-carbonitrile

Product 1

HCID 685848772-Cyclopropyl-7-[(3S)-3-(methylamino)pyrrolidin-1-yl]-5-methyl-6-(2-methyl-1,3-thiazol-4-yl)-1,3-benzoxazole-4-carbonitrileYield 17.5%

Reagents, catalysts & solvents 2

HCID 679Dimethyl SulfoxideSolventHCID 962WaterSolvent

Conditions

Temperature
90 °C

Procedure

2-Cyclopropyl-7-fluoro-5-methyl-6-(2-methyl-1,3-thiazol-4-yl)-1,3-benzoxazole-4-carbonitrile (I-80) (100 mg, 0.32 mmol) was dissolved in dimethyl sulfoxide (2 ml), triethylamine (112 μl, 0.80 mmol) and (3S)-3-methylaminopyrrolidine (44 μl, 0.42 mmol) were added, followed by stirring at 90° C. for 6 hours under nitrogen atmosphere. After cooling to room temperature, ethyl acetate was added, followed by fractionation with water. The organic layer was washed with saturated brine, dried over anhydrous sodium sulfate. The solvent was evaporated away and the resulting residue was subjected to preparative thin-layer silica gel column chromatography, eluted with a mixed solvent of chloroform/methanol (10:1, v/v) followed by recrystallization and purification with a mixed solvent of diethyl ether/ethyl acetate/n-hexane to obtain the entitled compound (22 mg, 17%) as a white solid.

Workup

  1. temperatureAfter cooling to room temperature
  2. washThe organic layer was washed with saturated brine
  3. dry with materialdried over anhydrous sodium sulfate
  4. customThe solvent was evaporated away
  5. washeluted with a mixed solvent of chloroform/methanol (10:1
  6. customv/v) followed by recrystallization and purification with a mixed solvent of diethyl ether/ethyl acetate/n-hexane

Sources & evidence

ORD record
ord-8e91639c1fcc4e6c8f63a502696c87a4
Source dataset
uspto-grants-2010_06
Patent number
US07737166B2

Reaction notes

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