Potassium Carbonate → 3-(3-Bromophenyl)pyridine

HRID 538913Notes

Reaction equation

[Br:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4](I)[CH:3]=1.[N:9]1[CH:14]=[CH:13][CH:12]=[C:11](B(O)O)[CH:10]=1.C([O-])([O-])=O.[K+].[K+]>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.O1CCOCC1>[Br:1][C:2]1[CH:3]=[C:4]([C:11]2[CH:10]=[N:9][CH:14]=[CH:13][CH:12]=2)[CH:5]=[CH:6][CH:7]=1

Participants

Conditions

Temperature: 100 °C

Procedure

1-bromo-3-iodobenzene (1.118 g, 3.95 mol) and 3-pyridine boronic acid (0.559 g, 4.54 mol) were added to a 100 mL three neck round bottom flask. To this flask, dioxane (20 mL) and aqueous K2CO3 (2 N, 20 mL) were added. The mixture was stirred and degassed with a steam of argon for 30 minutes. Then under argon atmosphere, 50 mg (0.04 mmol) of Pd(PPh3)4 (1%) was added. The mixture was heated to 100° C. and stirred overnight. The next day, the solvent was removed by roto-evaporation and the residue was suspended into an equal amount of water (50 mL) and CH2Cl2 (50 mL). The organic layer was separated from aqueous layer and washed with brine (50 mL×3). After drying over Na2SO4, and removal of the drying agent, about 0.92 g of 3-(3-bromophenyl)pyridine product (100%) was afforded. 1H NMR (400 MHz, CDCl3) 8.85 (s, 1H), 8.65 (d, 1H), 7.87 (d, 1H), 7.75 (s, 1H), 7.57-7.52 (m, 2H), 7.41-7.35 (m, 2H).

Workup

customdegassed with a steam of argon for 30 minutes
stirringstirred overnight
customThe next day, the solvent was removed by roto-evaporation
customThe organic layer was separated from aqueous layer
washwashed with brine (50 mL×3)
dry with materialAfter drying over Na2SO4, and removal of the drying agent

Sources & evidence

ORD record: ord-e89a2ea55392477c9cea45bea11590fd
Source dataset: uspto-grants-2014_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08865905B2

Reaction notes

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