HuagongsheHuagongshe Chemistry Print Report · For research reference only
Potassium Carbonate → methyl 4-(1,4-dimethyl-1H-pyrazol-5-yl)-5-methyl-2-thiophenecarboxylate
Participants
| Role | Name | HCID | Charge |
|---|---|---|---|
| Reactant | Potassium Carbonate | HCID 11430 | — |
| Reactant | Trimethylboroxine | HCID 574072 | — |
| Reactant | methyl 4-(4-bromo-1-methyl-1H-pyrazol-5-yl)-5-methyl-2-thiophenecarboxylate | HCID 57826393 | — |
| Catalyst | Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+) | HCID 178418228 | — |
| Solvent | Dimethylformamide | HCID 6228 | — |
| Product | methyl 4-(1,4-dimethyl-1H-pyrazol-5-yl)-5-methyl-2-thiophenecarboxylate | HCID 57826452 | 72.1% |
Reaction Steps
A solution of methyl 4-(4-bromo-1-methyl-1H-pyrazol-5-yl)-5-methyl-2-thiophenecarboxylate (420 mg, 1.33 mmol), potassium carbonate (921 mg, 6.66 mmol), PdCl2(dppf) (98 mg, 0.13 mmol) and trimethylboroxine (0.371 ml, 2.67 mmol) in N,N-dimethylformamide (6.663 ml) was stirred at 110° C. in a sealed tube for 2 h. This reaction was run in two batches (100 mg and 420 mg) which were combined and partitioned between H2O-DCM. The aqueous phase was washed several times with DCM and the combined organic fractions were dried over Na2SO4, concentrated and purified via column chromatography (10-50% EtOAc in hexanes) affording methyl 4-(1,4-dimethyl-1H-pyrazol-5-yl)-5-methyl-2-thiophenecarboxylate (240 mg, 58%) as a yellow oil: LCMS (ES) m/e 251 (M+H)+.
Provenance & Evidence
| DOI | 10.6084/m9.figshare.5104873.v1 |
|---|---|
| Patent number | US08273782B2 |
| Source dataset | uspto-grants-2012_09 |
| ORD ID | ord-475b0969a9ce4c1eab764ed4a389d857 |
| Source note | uspto-grants-2012_09 |