Cesium carbonate → 1-Ethyl-3-(6-methoxypyridin-3-yl)-1H-pyrazolo[4,3-b]pyridine

HRID 573330Notes

Reaction equation

HRID 573330 reaction equation
Br[C:2]1[C:6]2=[N:7][CH:8]=[CH:9][CH:10]=[C:5]2[N:4]([CH2:11][CH3:12])[N:3]=1.[CH3:13][O:14][C:15]1[N:20]=[CH:19][C:18](B(O)O)=[CH:17][CH:16]=1.CC(C1C=C(C(C)C)C(C2C=CC=CC=2P(C2CCCCC2)C2CCCCC2)=C(C(C)C)C=1)C.C([O-])([O-])=O.[Cs+].[Cs+]>C1COCC1.O.CC([O-])=O.CC([O-])=O.[Pd+2]>[CH2:11]([N:4]1[C:5]2[C:6](=[N:7][CH:8]=[CH:9][CH:10]=2)[C:2]([C:18]2[CH:19]=[N:20][C:15]([O:14][CH3:13])=[CH:16][CH:17]=2)=[N:3]1)[CH3:12]

Participants

8

Reactant 4

HCID 10796Cesium carbonateHCID 2734368(6-Methoxypyridin-3-yl)boronic acidHCID 111557942-Dicyclohexylphosphino-2',4',6'-triisoprophylbiphenylHCID 667278823-bromo-1-ethyl-1H-pyrazolo[4,3-b]pyridine

Product 1

HCID 866889861-Ethyl-3-(6-methoxypyridin-3-yl)-1H-pyrazolo[4,3-b]pyridineYield 88.9%

Reagents, catalysts & solvents 3

HCID 167845palladium(II) acetateCatalystHCID 962WaterSolvent2×HCID 8028TetrahydrofuranSolvent

Procedure

To a mixture of 3-bromo-1-ethyl-1H-pyrazolo[4,3-b]pyridine (120 mg), 6-methoxypyridin-3-ylboronic acid (122 mg), Pd(OAc)2 (11.92 mg) and Xphos (50.6 mg) in THF (3 mL) was added a solution of Cs2CO3 (346 mg) in H2O (1 mL). The mixture was exposed to microwave irradiation at 100° C. for 30 min, treated with water, and extracted with AcOEt. The organic layer was dried over MgSO4 and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (AcOEt/hexane) to give the title compound (120 mg).

Workup

  1. customirradiation at 100° C. for 30 min
  2. extractionextracted with AcOEt
  3. dry with materialThe organic layer was dried over MgSO4
  4. concentrationconcentrated under reduced pressure
  5. customThe residue was purified by silica gel column chromatography (AcOEt/hexane)

Sources & evidence

ORD record
ord-31d4cf53d3914813bbe0f986951b0953
Source dataset
uspto-grants-2015_05
Patent number
US09029536B2

Reaction notes

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