Benzene, 1-bromo-2,4-dimethyl- → HCID 67381065, compound

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Reaction Steps

To a mixture of 1-bromo-2,4-dimethylbenzene (3.8 mL), (R)-4-N-Boc-2-methylpiperazine (5.0 g), palladium (II) acetate (281 mg), 2-(dicyclohexylphosphino)-2′,4′,6′-tri-isopropyl-1,1′-biphenyl (1.19 g) and sodium tert-butoxide (3.4 g) was added toluene (50 mL), and the mixture was refluxed for 3 hr. After cooling, the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, and the solvent was evaporated. The residue was purified by column chromatography (chloroform) to give (R)-4-(2,4-dimethylphenyl)-3-methylpiperazine-1-carboxylic acid tert-butyl ester. The compound was dissolved in chloroform (8.0 mL), 4N hydrogen chloride/ethyl acetate (8.0 mL) was added, and the mixture was stirred at room temperature overnight. The reaction mixture was alkalified, and extracted with chloroform. The organic layer was evaporated to give (R)-1-(2,4-dimethylphenyl)-2-methylpiperazine (1.2 g).

Provenance & Evidence