Buchwald–Hartwig amination, record ord-100bcab4f1bd45d89d76662307487cf4
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 | Benzene, 1-bromo-3-methyl-2-nitro- | C₇H₆BrNO₂ | |
| Reactant | tert-Butyl piperazine-1-carboxylate | C₉H₁₈N₂O₂ | |
| Reagent | Cesium carbonate | CCs₂O₃ | |
| Catalyst | 1,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine) | C₃₉H₃₂OP₂ | |
| Catalyst | Palladium (II) acetate | C₄H₈O₄Pd | |
| Solvent | 1,4-Dioxane | C₄H₈O₂ | |
| Product | 4-(3-Methyl-2-nitrophenyl)-piperazine-1-carboxylic acid tert-butyl ester | C₁₆H₂₃N₃O₄ | 16.81% |
Conditions
- Temperature
- 80 °C
Yield
- 17% of 4-(3-Methyl-2-nitrophenyl)-piperazine-1-carboxylic acid tert-butyl ester.
Procedure
Copied from the source record, unedited
tert-butyl piperazine-1-carboxylate (172 mg, 0.93 mmol) and 1-bromo-3-methyl-2-nitrobenzene (0.124 mL, 0.93 mmol), were added to a stirred solution of diacetoxypalladium (20.78 mg, 0.09 mmol), (9,9-dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphine) (107 mg, 0.19 mmol) and cesium carbonate (664 mg, 2.04 mmol) dissolved in dioxane (3 mL). The resulting solution was stirred at 80 °C under nitrogen overnight. The reaction mixture was filtered, dried under vaccum. The crude product was purified by flash chromatography on silica gel eluting with 5 to 15% ethyl acetate in petroleum ether. The solvent was evaporated to dryness to afford tert-butyl 4-(3-methyl-2-nitrophenyl)piperazine-1-carboxylate (50.0 mg, 16.81 %) as a orange oil.
The source
This record comes from experimental reaction archive (ord-100bcab4f1bd45d89d76662307487cf4). Open the source and check it against what is on this page.
experimental reaction archive record ord-100bcab4f1bd45d89d76662307487cf4 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.