Buchwald–Hartwig amination: 2,4-Dichloropyridine → 4-chloro-N-(2-methylpyrazol-3-yl)pyridin-2-amine
23% yield, run at 105 °C, as recorded by experimental reaction archive. The written procedure is below. One of 2 recorded runs making this product; all of them are compared below.
The atoms, from reactants to products
What was in the flask
| Role | Species | Formula | Yield |
|---|---|---|---|
| Reactant | 2,4-Dichloropyridine | C₅H₃Cl₂N | |
| Reactant | 2-Methyl-2H-pyrazol-3-ylamine | C₄H₇N₃ | |
| Reagent | Cesium carbonate | CCs₂O₃ | |
| Catalyst | 1,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine) | C₃₉H₃₂OP₂ | |
| Catalyst | Bis(dibenzylideneacetone)palladium | C₅₁H₄₂O₃Pd₂ | |
| Solvent | 1,4-Dioxane | C₄H₈O₂ | |
| Product | 4-chloro-N-(2-methylpyrazol-3-yl)pyridin-2-amine | C₉H₉ClN₄ | 23.41% |
Conditions
- Temperature
- 105 °C
Yield
- 23% of 4-chloro-N-(2-methylpyrazol-3-yl)pyridin-2-amine.
Every recorded run making this product
2 runs of this class made the same product and differed in what else was in the flask. They are listed from the highest yield down, with this page's run marked.
| Catalyst | Reagents | Solvent | Temp. | Time | Yield |
|---|---|---|---|---|---|
| 1,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine); Bis(dibenzylideneacetone)palladium | sodium 2-methylpropan-2-olate | 1,4-Dioxane | 130 °C | — | 60% |
| 1,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine); Bis(dibenzylideneacetone)palladium | Cesium carbonate | 1,4-Dioxane | 105 °C | — | 23% (this run) |
Procedure
Copied from the source record, unedited
TRIS(DIBENZYLIDENEACETONE)DIPALLADIUM(0) (124 mg, 0.14 mmol) was added in one portion to 2,4-dichloropyridine (200 mg, 1.35 mmol), 1-methyl-1H-pyrazol-5-amine (158 mg, 1.62 mmol), (9,9-dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine) (156 mg, 0.27 mmol), and cesium carbonate (881 mg, 2.70 mmol) in 1,4-dioxane (20 mL) under nitrogen. The resulting mixture was stirred at 105°C for 2 hours. The reaction mixture was evaporated to dryness and redissolved in DCM (50 mL), and washed with water (50 mL). The organic layer was filtered using phase separating paper and evaporated to afford crude product. The crude product was purified by flash silica chromatography, elution gradient 0 to 3% MeOH in DCM. Pure fractions were evaporated to dryness to afford 4-chloro-N-(1-methyl-1H-pyrazol-5-yl)pyr
The source
This record comes from experimental reaction archive (ord-17f82e7aaf404cf69c8e741e1af8f96f). Open the source and check it against what is on this page.
experimental reaction archive record ord-17f82e7aaf404cf69c8e741e1af8f96f from dataset "750 AstraZeneca ELN dataset" (url: https://chemrxiv.org/engage/chemrxiv/article-details/60c9e3f37792a23bfdb2d471). No atom mapping is provided by the source.
How to read this record
This is one experiment, not a rule. It says that on one occasion these species were combined under these conditions and this came out. It does not say the reaction will give the same result on your substrate, and nothing on the page has been generalised into a claim that it would.
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Where to next
More Buchwald–Hartwig amination records
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