Potassium Carbonate → 4-(2-Bromo-5-(trifluoromethyl)phenyl)pyridine

HRID 2172293Notes

Reaction equation

[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]([F:11])([F:10])[F:9])=[CH:4][C:3]=1I.[N:13]1[CH:18]=[CH:17][C:16](B(O)O)=[CH:15][CH:14]=1.C(=O)([O-])[O-].[K+].[K+]>O1CCOCC1.O>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]([F:11])([F:10])[F:9])=[CH:4][C:3]=1[C:16]1[CH:17]=[CH:18][N:13]=[CH:14][CH:15]=1

Participants

Conditions

Temperature: 120 °C

Procedure

A solution of pd(ph3p)4 (1.410 g, 1.220 mmol), 1-bromo-2-iodo-4-(trifluoromethyl)benzene (3.94 ml, 24.41 mmol), pyridin-4-ylboronic acid (3.00 g, 24.41 mmol), and potassium carbonate (13.49 g, 98 mmol) in 32 mL dioxane and 6 mL water was heated to 120° C. overnight. Additional portions of pyridin-4-ylboronic acid (3.00 g, 24.41 mmol) and potassium carbonate (13.49 g, 98 mmol) were added and the reaction mixture was heated to 120° C. for 3 hours. The reaction mixture was then poured into water and was extracted with DCM. The organics were then concentrated. Purification of the crude residue by silica gel column chromatography (0-100% EtOAc/heptane) gave 4-(2-bromo-5-(trifluoromethyl)phenyl)pyridine (3.054 g, 10.11 mmol, 41.4% yield) as a white solid. [M+H]+=303.9

Workup

extractionwas extracted with DCM
concentrationThe organics were then concentrated
customPurification of the crude residue by silica gel column chromatography (0-100% EtOAc/heptane)

Sources & evidence

ORD record: ord-0160cba926f14d01886ae1c13f15487d
Source dataset: uspto-grants-2015_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09051311B2

Reaction notes

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