Dimethylformamide → 5-bromo-2-chloro-N-cyclopropylbenzamide

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a toluene solution (1 M) of 5-bromo-2-chlorobenzoic acid (1 eq.) and DMF (1.2 eq.) was added at 0° C. oxalyl chloride (1.2 eq.) dropwise over 1 h. The resulting solution was stirred at 0° C. for 2 h before the volatiles were removed in vacuo. The resulting residue was taken up in dichloromethane (1 M), cooled to 0° C. and added sequentially cyclopropylamine (1.5 eq.) and Hunig's base (2 eq.) dropwise over 1 h. The resulting suspension was stirred at RT for 18 h. The reaction was quenched with 1 N HCl and extracted with dichloromethane. The combined organic extracts were dried over MgSO4, filtered and the filtrate concentrated in vacuo to ˜⅓ in volume. The resulting white suspension was added an equivalent volume of hexanes and the title compound was isolated via vacuum filtration.

Herkunft & Nachweise