m-Toluidine → N-(3-(1,3-dioxolan-2-yl)phenyl)-3-methylaniline

Beteiligte Stoffe

Reaktionsschritte

To a clean and dry 500 ml round bottom flask equipped with a reflux condenser and magnetic stir bar nitrogen was purged and anhydrous toluene (250.0 ml) was added by cannula. m-toluidine (5.1 ml, 0.0467 mol) was added to the reaction flask by syringe. Next, 2-(3-bromophenyl)-1,3-dioxolane (7.8 ml, 0.0513 mol) was added by syringe. The reaction solution was purged with a strong nitrogen flow for 30 minutes. Sodium tert-butoxide (6.73 g, 0.0701 mol) and Pd2dba3 (0.85 g, 0.0009 mol) were then added manually, followed by the addition of tri-tert-butylphosphine (0.57 g, 0.0028 mol) in toluene (˜8 ml) via syringe. The vessel was heated to reflux for approximately 4 hours. The reaction was then cooled to room temperature and filtered through a Celite and silica gel pad. Solvent was removed by rotary evaporation. The crude material was partially dissolved in a 10% ethyl acetate/hexane solution (20.0 ml) and purified by flash column chromatography providing near pure product. Further purification was carried out using an automatic column chromatography system using 5% ethyl acetate/hexane as an eluent. This provided pure product confirmed by NMR.

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