4-Chlorophenylboronic acid → 7-(4-Chlorophenyl)-8-(pyridin-4-yl)-2-((6-(trifluoromethyl)pyridin-3-yl)methyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2h)-one

HRID 2101285Notes

Reaction equation

Cl[C:2]1[CH:7]=[CH:6][N:5]2[C:8](=[O:22])[N:9]([CH2:11][C:12]3[CH:13]=[N:14][C:15]([C:18]([F:21])([F:20])[F:19])=[CH:16][CH:17]=3)[N:10]=[C:4]2[C:3]=1[C:23]1[CH:28]=[CH:27][N:26]=[CH:25][CH:24]=1.[Cl:29][C:30]1[CH:35]=[CH:34][C:33](B(O)O)=[CH:32][CH:31]=1>C1(C)C=CC=CC=1.C(=O)([O-])[O-].[Na+].[Na+].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>[Cl:29][C:30]1[CH:35]=[CH:34][C:33]([C:2]2[CH:7]=[CH:6][N:5]3[C:8](=[O:22])[N:9]([CH2:11][C:12]4[CH:13]=[N:14][C:15]([C:18]([F:19])([F:20])[F:21])=[CH:16][CH:17]=4)[N:10]=[C:4]3[C:3]=2[C:23]2[CH:28]=[CH:27][N:26]=[CH:25][CH:24]=2)=[CH:32][CH:31]=1

Participants

Conditions

Temperature: 100 °C

Procedure

To a suspension of 7-chloro-8-(pyridin-4-yl)-2-((6-(trifluoromethyl)pyridin-3-yl)methyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one (165 mg, 0.40 mmol), 4-chlorophenylboronic acid (190 mg, 1.20 mmol) in toluene (3.0 mL) and 2.0 M aqueous sodium carbonate (0.66 mL) was added (Ph3P)4Pd (70 mg, 0.06 mmol) in one portion, and the resulting yellow mixture was vigorously stirred under argon in a 100° C. oil bath for 2 h. HPLC/MS analysis indicated that the reaction was complete. After cooling to room temperature, the reaction mixture was partitioned between EtOAc and water. The EtOAc phase was washed with water, then saturated aqueous NaCl twice, dried over Na2SO4, and concentrated under reduced pressure to obtain crude product. The crude product was purified by silica gel (12 g) column chromatography eluting with a gradient of EtOAc (0-100%) in hexanes to provide the title compound as a light yellow foam (160 mg), which was crystallized from hot methanol to afford 60 mg of pure product. The mother liquor was concentrated, and the residue was purified by preparative reverse phase HPLC (Phenomenex Luna 5 μm C-18 21.2×100 mm column eluted with a linear gradient of 40% to 80% B over 8 min (A=0.1% trifluoroacetic acid, 90% water, 10% methanol and B=0.1% trifluoroacetic acid, 90% methanol, 10% water) with flow rate at 20 mL/min and UV detection at 220 nm). The desired fractions were concentrated under reduced pressure. The resulting residue was dissolved in EtOAc, washed with saturated aqueous Na2CO3 once, water twice, then saturated aqueous NaCl, dried over Na2SO4 and evaporated. The residue was dissolved in acetonitrile, frozen and lyophilized to afford an additional 88 mg of pure title compound as a light yellow powder. HPLC/MS: retention time=2.70 min, [M+H]+=482. 1H NMR (CDCl3, 400 MHz): δ 8.78 (s, 1H), 8.57 (d, J=6.2 Hz, 2H), 7.91 (dd, J=1.8, 7.9 Hz, 1H), 7.86 (d, J=7.0 Hz, 1H), 7.67 (d, J=7.9 Hz, 1H), 7.26 (d, J=8.4 Hz, 2H), 7.17 (d, J=6.2 Hz, 2H), 7.05 (d, J=8.4 Hz, 2H), 6.65 (d, J=7.5 Hz, 1H), 5.25 (s, 2H).

Workup

temperatureAfter cooling to room temperature
customthe reaction mixture was partitioned between EtOAc and water
washThe EtOAc phase was washed with water
dry with materialsaturated aqueous NaCl twice, dried over Na2SO4
concentrationconcentrated under reduced pressure
customto obtain crude product
customThe crude product was purified by silica gel (12 g) column chromatography
washeluting with a gradient of EtOAc (0-100%) in hexanes

Sources & evidence

ORD record: ord-4924f25a0d654694bbe6e431c3e87ef0
Source dataset: uspto-grants-2009_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07572808B2

Reaction notes

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