Thionyl Chloride → Lercanidipine Impurity 5

Participants

Reaction Steps

Thionyl chloride (0.4 g, 3.4 mmol) was slowly added to a solution of 5-methoxycarbonyl-2,6-dimethyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3-carboxylic acid (1.0 g, 3 mmol) in dichloromethane dropwisely at −25° C. After the completion of the dropwise addition, the reaction was continued under cooling in an ice bath until the solution became clear. After the completion of reaction, the reaction solution was rotary evaporated to dryness to produce a crude product, which was directly used in the next step.

Provenance & Evidence