Potassium Carbonate → 7-bromo-2-isobutyl-8-p-tolyl-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

HRID 2101366Notes

Reaction equation

[Br:1][C:2]1[CH:7]=[CH:6][N:5]2[C:8](=[O:15])[N:9]([CH2:11][CH:12]([CH3:14])[CH3:13])[N:10]=[C:4]2[C:3]=1I.[CH3:17][C:18]1[CH:23]=[CH:22][C:21](B(O)O)=[CH:20][CH:19]=1.C([O-])([O-])=O.[K+].[K+]>O1CCOCC1.O.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>[Br:1][C:2]1[CH:7]=[CH:6][N:5]2[C:8](=[O:15])[N:9]([CH2:11][CH:12]([CH3:14])[CH3:13])[N:10]=[C:4]2[C:3]=1[C:21]1[CH:22]=[CH:23][C:18]([CH3:17])=[CH:19][CH:20]=1

Participants

Conditions

Temperature: 100 °C

Procedure

To a stirring, degassed mixture of 7-bromo-8-iodo-2-isobutyl-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one (0.1 g, 0.25 mmol), 4-methylphenylboronic acid (0.04 g, 0.28 mmol), and tetrakis(triphenylphosphine)palladium (15 mg, 0.013 mmol) in dioxane (2.0 mL) at 20° C. was added K2CO3 (0.04 g, 0.28 mmol) in water (0.6 mL). The resulting reaction mixture was stirred at 100° C. for 15 h under argon. Analysis by HPLC/MS indicated that starting material had been consumed. The reaction mixture was brought to room temperature and was concentrated under reduced pressure. The crude product was purified by reverse phase preparative HPLC (acetonitrile-water-TFA) to isolate 31 mg of the title compound as a yellow oil. MS: [M+H]+=360.

Workup

customTo a stirring, degassed
customThe resulting reaction mixture
customhad been consumed
customwas brought to room temperature
concentrationwas concentrated under reduced pressure
customThe crude product was purified by reverse phase preparative HPLC (acetonitrile-water-TFA)

Sources & evidence

ORD record: ord-529c219e19934d49a2f987526787b49c
Source dataset: uspto-grants-2009_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07572808B2

Reaction notes

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