Cesium carbonate → 2-(2-(1,5-naphthyridin-2-yl)ethyl)-8-(pyridin-4-yl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

HRID 1777790Notes

Reaction equation

HRID 1777790 reaction equation
[N:1]1[C:10]2[C:5](=[N:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][C:2]=1[CH2:11][CH2:12][N:13]1[C:22](=[O:23])[N:16]2[CH:17]=[CH:18][CH:19]=[C:20](Br)[C:15]2=[N:14]1.[N:24]1[CH:29]=[CH:28][C:27](B(O)O)=[CH:26][CH:25]=1.C([O-])([O-])=O.[Cs+].[Cs+]>O1CCOCC1.CCOC(C)=O.CC(C)([P](C(C)(C)C)([Pd][P](C(C)(C)C)(C(C)(C)C)C(C)(C)C)C(C)(C)C)C>[N:1]1[C:10]2[C:5](=[N:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][C:2]=1[CH2:11][CH2:12][N:13]1[C:22](=[O:23])[N:16]2[CH:17]=[CH:18][CH:19]=[C:20]([C:27]3[CH:28]=[CH:29][N:24]=[CH:25][CH:26]=3)[C:15]2=[N:14]1

Participants

7

Reactant 3

HCID 10796Cesium carbonateHCID 2734379(Pyridin-4-yl)boronic acidHCID 715716702-(2-(1,5-naphthyridin-2-yl)ethyl)-8-bromo-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Product 1

HCID 715717822-(2-(1,5-naphthyridin-2-yl)ethyl)-8-(pyridin-4-yl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-oneYield 23%

Reagents, catalysts & solvents 3

HCID 178418851HCID 178418851, compoundCatalystHCID 8857Ethyl AcetateSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
100 °C

Procedure

Triazolopyridinone 10-3 (22 mg, 0.059 mmol) and pyridin-4-ylboronic acid (11 mg, 0.089 mmol) were placed in a microwave vial and dissolved in dioxane (1 mL). To the mixture was added 1 M aq. Cs2CO3 solution (0.12 mL, 0.12 mmol). The mixture was then sparged with N2 gas for 3 min, and bis(tri-tert-butylphosphine)palladium (3.0 mg, 0.006 mmol) was added. The vial was capped and heated at 100° C. under microwave irradiation for 20 min. After cooling, the reaction mixture was diluted with EtOAc (30 mL), washed with water (10 mL) and brine (10 mL), dried over MgSO4, filtered, and concentrated in vacuo. The residue was purified by silica gel flash column chromatography (12 g cartridge), eluting with 0-15% MeOH/CH2Cl2. The fractions containing the desired product (10-4) were pooled, and after solvent removal in vacuo, 5.0 mg (23%) of a semisolid were obtained. 1H NMR (300 MHz, CHCl3-d): δ 8.95 (dd, J=4.2, 1.6 Hz, 1H), 8.63 (dd, J=4.8, 1.5 Hz, 2H), 8.37-8.31 (m, 2H), 7.84 (dd, J=6.9, 1.2 Hz, 1H), 7.71 (dd, J=4.8, 1.8 Hz, 2H), 7.63 (dd, J=8.7, 4.2 Hz, 1H), 7.57 (d, J=9.0 Hz, 1H), 7.39 (dd, J=6.9, 1.2 Hz, 1H), 6.64 (t, J=6.9 Hz, 1H), 4.65 (t, J=6.9 Hz, 2H), 3.60 (t, J=6.9 Hz, 2H). HRMS (ES) 369.1443 found (M+H), 369.1461 required.

Workup

  1. customThe mixture was then sparged with N2 gas for 3 min
  2. customThe vial was capped
  3. temperatureAfter cooling
  4. washwashed with water (10 mL) and brine (10 mL)
  5. dry with materialdried over MgSO4
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customThe residue was purified by silica gel flash column chromatography (12 g cartridge)
  9. washeluting with 0-15% MeOH/CH2Cl2
  10. additionThe fractions containing the desired product (10-4)
  11. customafter solvent removal in vacuo

Sources & evidence

ORD record
ord-f0b6c5263ccd44ab8b386347e6105fa7
Source dataset
uspto-grants-2016_02
Patent number
US09266881B2

Reaction notes

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