Thionyl Chloride → 5-Bromo-2-chloro-N-[2-(ethylamino)pyridin-3-yl]pyridine-3-carboxamide

Participants

Reaction Steps

To a cooled solution of 3-amino-2-(ethylamino)pyridine (30.6 g, 223 mmol) in MeCN (740 mL) was added solid NaHCO3 (56.3 g, 669 mmol). After 5 min, crude 5-bromo-2-chloro-3-pyridinecarbonyl chloride (prepared from 5-bromo-2-hydroxy-3-pyridinecarboxylic acid and SOCl2 [as described by T. W. Gero et al. in Synth. Commun. 1989, 19, 553-559 (incorporated herein by reference) but with omission of the aqueous work-up] was added (1 equiv., 223 mmol). After 2 h, the reaction mixture was poured over ice/H2O (1.5 L) and the resulting solid was filtered, rinsed with H2O and then hexane. After drying under reduced pressure overnight, the title compound was obtained as a black solid (54.9 g, 69% yield).

Provenance & Evidence