Benzene, 4-bromo-1,2-dimethoxy- → tert-butyl (2R)-4-(3,4-dimethoxyphenyl)-2-propan-2-ylpiperazine-1-carboxylate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

22-Apr-09 09:56:23 +0100 4-bromo-1,2-dimethoxybenzene (0.068 mL, 0.46 mmol), (R)-tert-butyl 2-isopropylpiperazine-1-carboxylate (126 mg, 0.55 mmol) and BIS(TRI-T- BUTYLPHOSPHINE)PALLADIUM(0) (23.54 mg, 0.05 mmol) and potassium 2-methylpropan-2-olate (76 mg, 0.64 mmol) were suspended in THF (5 mL) and sealed into a microwave tube. The reaction was heated to 150 °C for 10 minutes in the microwave reactor and cooled to RT. LC-MS shows no starting material. The reaction mixture was filtered and the crude product was purified by flash silica chromatography, elution gradient 0 to 20% EtOAc in isohexane. Pure fractions were evaporated to dryness to afford (R)-tert-butyl 4-(3,4-dimethoxyphenyl)-2-isopropylpiperazine-1-carboxylate (152 mg, 91 %) as a yellow gum.

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