2-Bromo-5-fluorotoluene → Tert-butyl 4-(4-fluoro-2-methylphenyl)piperazine-1-carboxylate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

In a 200ml flask was added 1-bromo-4-fluoro-2-methylbenzene (2 g, 10.58 mmol) and TERT-BUTYL 1-PIPERAZINECARBOXYLATE (2.365 g, 12.70 mmol), CESIUM CARBONATE (5.17 g, 15.87 mmol) , BINAP (0.791 g, 1.27 mmol) 18-CROWN-6 (0.336 g, 1.27 mmol), followed by toluene (25 ml). Degass the mixture. TRIS(DIBENZYLIDENEACETONE)DIPALLADIUM(0) (0.581 g, 0.63 mmol) was added. Heat at 110oC under nitrogen in an oil bath for overnight. The reaction mixture was diluted with ethyl acetate and filtered through celite. The Celite was washed with EtOAC. The EtOAC was concentrated down to give a brown oil. The crude product was purified by silica gel column(40g) and was eluted with 0% EtOAC/Hexane -50% EtOAC/Hexane. Yield: 0.5g Yellow oil.

Herkunft & Nachweise