3-Aminopyridine → 4-chloro-N-pyridin-3-ylpyridin-2-amine

HRID 204

Reaction equation

HRID 204 reaction equation
Clc1ccnc(Cl)c1.Nc1cccnc1>C1COCCO1.CC(=O)O.CC(=O)O.CC1(C)c2cccc(P(c3ccccc3)c3ccccc3)c2Oc2c(P(c3ccccc3)c3ccccc3)cccc21.O=C([O-])[O-].[Cs+].[Cs+].[Pd]>Clc1ccnc(Nc2cccnc2)c1

Participants

7

Reactant 2

HCID 100093-AminopyridineHCID 335152,4-Dichloropyridine

Product 1

HCID 1022185124-chloro-N-pyridin-3-ylpyridin-2-amineYield 51.48%

Reagents, catalysts & solvents 4

HCID 10796Cesium carbonateReagentHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)CatalystHCID 4144353Palladium (II) acetateCatalystHCID 312751,4-DioxaneSolvent

Conditions

Temperature
100 °C

Procedure

pyridin-3-amine (95 mg, 1.01 mmol), 2,4-dichloropyridine (0.151 mL, 1.01 mmol), 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (70.4 mg, 0.12 mmol) and cesium carbonate (660 mg, 2.03 mmol) were stirred in dioxane (5 mL). The mixture was purged with nitrogen for 10 minutes. Palladium(II) acetate (22.76 mg, 0.10 mmol) was added and the mixture heated at 100 °C for 2h. The mixture was cooled, filtered and concentrated. The crude product was purified by flash silica chromatography, eluting gradient 5-45% EtOAc in isohexane. Fractions were evaporated to dryness and purified by flash silica chromatography, eluting at 35% EtOAc in isohexane to afford 4-chloro-N-(pyridin-3-yl)pyridin-2-amine (107 mg, 51.5 %) as a cream powder.

Sources & evidence

ORD record
ord-3c36e457f5e64b5b9130db89ea6a541e
Source dataset
750 AstraZeneca ELN dataset
Original link
View source

Linked notes

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