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

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Reaction Conditions

Reaction Steps

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.

Provenance & Evidence