Diisopropylethylamine → HCID 11696413, compound

Participants

Reaction Conditions

Reaction Steps

A 22 L 3-neck RBF equipped with a cooling bath, mechanical stirrer, thermocouple, and nitrogen bubbler was purged with nitrogen for at least ten minutes. The flask was charged with 1.441 kg (4.990 mol) 1-[(R)-3-(3-amino-5-fluoro-phenoxy)-piperidin-1-yl]-ethanone HCl salt and 14.4 L (10 vol) dichloromethane. The solution was stirred, and 0.710 kg (5.489 mol) DIPEA was charged. The solution was cooled to 10±5° C. in an ice/brine bath. The reaction was charged with 0.659 kg (5.489 mol) 3-isocyanato-pyridine and the solution warmed to room temperature and stirred for three hours. The reaction was monitored by TLC (1:9 methanol:ethyl acetate/PMA stain) and HPLC. The reaction stirred at room temperature for five more hours, and another 0.009 kg (0.075 mol) 3-isocyanato-pyridine was added. The solution stirred for 15 more hours, and the reaction was deemed complete. The solution was poured into a 50 L extractor containing 14.4 L (10 vol) saturated sodium bicarbonate, and the flask was rinsed with an additional 1.44 L (1 vol) dichloromethane. The layers were separated, and the organic layer was washed with 14.4 L (2×10 vol) water. The organic layer was dried with 1.69 kg sodium sulfate for at least 20 minutes before proceeding to the next step.

Provenance & Evidence