2-Bromopyridine → Methyl 2,4-dichloro-5-(pyridin-2-yl)benzoate

HRID 522146Notes

Reaction equation

[Cl:1][C:2]1[CH:11]=[C:10]([Cl:12])[C:9](B2OC(C)(C)C(C)(C)O2)=[CH:8][C:3]=1[C:4]([O:6][CH3:7])=[O:5].Br[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][N:24]=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>[Cl:1][C:2]1[CH:11]=[C:10]([Cl:12])[C:9]([C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][N:24]=2)=[CH:8][C:3]=1[C:4]([O:6][CH3:7])=[O:5]

Participants

Conditions

Temperature: 110 °C

Procedure

To a solution of methyl 2,4-dichloro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoate (Preparation 45, 5 g, 15 mmol) in dioxane (30 mL) and water (10 mL) was added 2-bromopyridine (1.73 mL, 18 mmol), tetrakis(triphenylphosphine)palladium (0) (1.75 g, 1.51 mmol) and potassium carbonate (4.18 g, 30 mmol). The reaction was heated to 110° C. The reaction was cooled, extracted into EtOAc and separated. The organic layer was washed with brine, dried over magnesium sulphate and concentrated in vacuo. The residue was purified using silica gel column chromatography eluting with 10-50% EtOAc in heptanes followed by trituration with TBME to afford the title compound (3.96 g, 93%).

Workup

temperatureThe reaction was cooled
extractionextracted into EtOAc
customseparated
washThe organic layer was washed with brine
dry with materialdried over magnesium sulphate
concentrationconcentrated in vacuo
customThe residue was purified
washeluting with 10-50% EtOAc in heptanes

Sources & evidence

ORD record: ord-7e00d6fc1d4f4f9abb9a361845678ff8
Source dataset: uspto-grants-2016_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09328096B2

Reaction notes

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