Buchwald–Hartwig amination, record ord-5d8d88656735435b992c60c9f2e9cc2e
One recorded run of this reaction. Below is what the source recorded, and nothing added to it.
What was in the flask
| Role | Species | Formula | Yield |
|---|---|---|---|
| Reactant | 2,4-Dichloropyridine | C₅H₃Cl₂N | |
| Reactant | Ethyl 2-amino-1,3-oxazole-5-carboxylate | C₆H₈N₂O₃ | |
| 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 | Ethyl 2-[(4-chloro-2-pyridinyl)amino]-1,3-oxazole-5-carboxylate | C₁₁H₁₀ClN₃O₃ | 95.3% |
Conditions
- Temperature
- 160 °C
Yield
- 95% of Ethyl 2-[(4-chloro-2-pyridinyl)amino]-1,3-oxazole-5-carboxylate.
Procedure
Copied from the source record, unedited
Objective: To make the coupled product on a larger scale for hydrolysis/decarboxylation Pd2(dba)3 (80 mg, 0.09 mmol), 9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene (152 mg, 0.26 mmol), 2,4-dichloropyridine (0.378 mL, 3.50 mmol), cesium carbonate (2279 mg, 6.99 mmol) and ethyl 2-aminooxazole-5-carboxylate (546 mg, 3.50 mmol) were added to an oven dried microwave vial and the vial was capped and placed under an inert atmosphere, dioxane (18 mL) was added and the resulting mixture was heated to 160 °C for 1 h by microwave irradiation under a nitrogen atmosphere. The crude product was purified by flash silica chromatography, elution gradient 0 to 3% MeOH (7 N ammonia) in DCM. Pure fractions were evaporated to dryness to afford ethyl 2-(4-chloropyridin-2-ylamino)oxazole-5-carboxylate (892 m
The source
This record comes from experimental reaction archive (ord-5d8d88656735435b992c60c9f2e9cc2e). Open the source and check it against what is on this page.
experimental reaction archive record ord-5d8d88656735435b992c60c9f2e9cc2e 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.
The pathway is a separate question, kept on separate pages. A mechanism here is the canonical arrow pushing for a class, run on real structures and labelled rule-derived. It is not evidence, and this record is not a mechanism.