Cesium carbonate → ethyl 5-[4-(6-ethoxy-2,4-dimethylpyridin-3-yl)-2-nitrophenyl]-1-[(S)-tetrahydrofuran-3-yl]-1H-pyrazole-4-carboxylate

HRID 1043969Notes

Reaction equation

HRID 1043969 reaction equation
[N+:1]([C:4]1[CH:9]=[C:8](B2OC(C)(C)C(C)(C)O2)[CH:7]=[CH:6][C:5]=1[C:19]1[N:23]([C@H:24]2[CH2:28][CH2:27][O:26][CH2:25]2)[N:22]=[CH:21][C:20]=1[C:29]([O:31][CH2:32][CH3:33])=[O:30])([O-:3])=[O:2].Br[C:35]1[C:36]([CH3:45])=[N:37][C:38]([O:42][CH2:43][CH3:44])=[CH:39][C:40]=1[CH3:41].C(=O)([O-])[O-].[Cs+].[Cs+]>O1CCOCC1.O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:43]([O:42][C:38]1[N:37]=[C:36]([CH3:45])[C:35]([C:8]2[CH:7]=[CH:6][C:5]([C:19]3[N:23]([C@H:24]4[CH2:28][CH2:27][O:26][CH2:25]4)[N:22]=[CH:21][C:20]=3[C:29]([O:31][CH2:32][CH3:33])=[O:30])=[C:4]([N+:1]([O-:3])=[O:2])[CH:9]=2)=[C:40]([CH3:41])[CH:39]=1)[CH3:44]

Participants

7

Reactant 3

HCID 10796Cesium carbonateHCID 86686354HCID 86686354, compoundHCID 86686385Ethyl 5-[2-nitro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl][(S)-tetrahydrofuran-3-yl]-1H-pyrazole-4-carboxylate

Product 1

HCID 86686405ethyl 5-[4-(6-ethoxy-2,4-dimethylpyridin-3-yl)-2-nitrophenyl]-1-[(S)-tetrahydrofuran-3-yl]-1H-pyrazole-4-carboxylate

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolventHCID 312751,4-DioxaneSolvent

Procedure

Ethyl 5-[2-nitro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl][(S)-tetrahydrofuran-3-yl]-1H-pyrazole-4-carboxylate obtained in Preparation Example 7-(2) (200 mg) was dissolved in a mixed solution of 1,4-dioxane (4 mL) and water (1 mL). 3-bromo-6-ethoxy-2,4-dimethylpyridine obtained in Preparation Example 51 (121 mg), Pd(PPh3)4 (25 mg) and cesium carbonate (428 mg) were added, and the mixture was reacted using a microwave reactor at 130° C. for three hours. The reaction mixture was returned to room temperature, followed by extraction with ethyl acetate. The organic layer was washed with brine and dried over anhydrous sodium sulfate. The desiccant was removed by filtration, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/n-heptane, 30% to 100%) to give the title compound (97 mg).

Workup

  1. additionwere added
  2. customthe mixture was reacted
  3. customat 130° C.
  4. customfor three hours
  5. customwas returned to room temperature
  6. extractionfollowed by extraction with ethyl acetate
  7. washThe organic layer was washed with brine
  8. dry with materialdried over anhydrous sodium sulfate
  9. customThe desiccant was removed by filtration
  10. concentrationthe filtrate was concentrated under reduced pressure
  11. customThe residue was purified by silica gel column chromatography (ethyl acetate/n-heptane, 30% to 100%)

Sources & evidence

ORD record
ord-3d2825aacff9468abd4f29f1cb42ddd1
Source dataset
uspto-grants-2013_10
Patent number
US08563565B2

Reaction notes

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