(Pyridin-4-yl)boronic acid → 4-(azetidine-1-carbonyl)-2-methyl-2H-pyrazole-3-carboxylic acid (2-pyridin-4-yl-[1,2,4]triazolo[1,5-a]pyridin-7-yl)-amide

HRID 1802252Notes

Reaction equation

HRID 1802252 reaction equation
[N:1]1([C:5]([C:7]2[CH:8]=[N:9][N:10]([CH3:25])[C:11]=2[C:12]([NH:14][C:15]2[CH:20]=[CH:19][N:18]3[N:21]=[C:22](Br)[N:23]=[C:17]3[CH:16]=2)=[O:13])=[O:6])[CH2:4][CH2:3][CH2:2]1.[N:26]1[CH:31]=[CH:30][C:29](B(O)O)=[CH:28][CH:27]=1>O1CCOCC1.C(=O)([O-])[O-].[Na+].[Na+].[Pd](Cl)Cl.C1(P(C2C=CC=CC=2)[C-]2C=CC=C2)C=CC=CC=1.[C-]1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=C1.[Fe+2].C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.[Fe+2]>[N:26]1[CH:31]=[CH:30][C:29]([C:22]2[N:23]=[C:17]3[CH:16]=[C:15]([NH:14][C:12]([C:11]4[N:10]([CH3:25])[N:9]=[CH:8][C:7]=4[C:5]([N:1]4[CH2:4][CH2:3][CH2:2]4)=[O:6])=[O:13])[CH:20]=[CH:19][N:18]3[N:21]=2)=[CH:28][CH:27]=1

Participants

6

Reactant 2

HCID 2734379(Pyridin-4-yl)boronic acidHCID 573782924-(azetidine-1-carbonyl)-N-(2-bromo-[1,2,4]triazolo[1,5-a]pyridin-7-yl)-1-methyl-1H-pyrazole-5-carboxamide

Product 1

HCID 573783874-(azetidine-1-carbonyl)-2-methyl-2H-pyrazole-3-carboxylic acid (2-pyridin-4-yl-[1,2,4]triazolo[1,5-a]pyridin-7-yl)-amideYield 18.8%

Reagents, catalysts & solvents 3

HCID 1784797961,1'-bis(diphenylphosphino)ferrocene palladium (II) chloride dppfCatalystHCID 10340Sodium CarbonateSolventHCID 312751,4-DioxaneSolvent

Procedure

Through a mixture of 4-(azetidine-1-carbonyl)-N-(2-bromo-[1,2,4]triazolo[1,5-a]pyridin-7-yl)-1-methyl-1H-pyrazole-5-carboxamide (150 mg, 371 μmol) and pyridin-4-ylboronic acid (68.4 mg, 557 μmol) in dioxane (4 ml) and sat. sodium carbonate solution (1 ml) was bubbled nitrogen for 10 minutes, then 1,1′-bis(diphenylphosphino)ferrocene palladium (II) chloride/dppf (15.2 mg, 18.6 μmol) was added and the resulting mixture was refluxed for 18 hours under nitrogen atmosphere. The solvent was evaporated and the residue was diluted with ethyl acetate and washed with water, the organic layer was separated, dried over magnesium sulfate, filtrated and evaporated. The crude material was applied on silicagel and purified by flash chromatography over a 20 g silicagel column using ethyl acetate/methanol 2-5% as eluent affording 4-(azetidine-1-carbonyl)-2-methyl-2H-pyrazole-3-carboxylic acid (2-pyridin-4-yl-[1,2,4]triazolo[1,5-a]pyridin-7-yl)-amide (28 mg, 18.8%) as a white solid. mp: >250° C., MS: m/z=403.0 (M+H+)

Workup

  1. customwas bubbled nitrogen for 10 minutes
  2. temperaturethe resulting mixture was refluxed for 18 hours under nitrogen atmosphere
  3. customThe solvent was evaporated
  4. additionthe residue was diluted with ethyl acetate
  5. washwashed with water
  6. customthe organic layer was separated
  7. dry with materialdried over magnesium sulfate
  8. filtrationfiltrated
  9. customevaporated
  10. custompurified by flash chromatography over a 20 g silicagel column

Sources & evidence

ORD record
ord-0e0ffa42823a4b31964b185f8ccbb63c
Source dataset
uspto-grants-2013_01
Patent number
US08349824B2

Reaction notes

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