918659-10-6Relevant articles and documents
Identification and synthesis of impurities formed during preparation of azelnidipine
Rao, K. Sudarshan,Rao, K. Nageswara,Chavan, Bhausaheb,Muralikrishna,Jayashree
, p. 4675 - 4678 (2014/12/10)
Azelnidipine (1), dihydropyridine-based calcium antagonists (DHPs) are one of the widely used drugs for treatment of hypertension. During the laboratory optimization and later during its bulk synthesis the formation of various impurities was observed. The impurities formed were monitored and their structures were tentatively assigned on the basis of their fragmentation patterns in LC-MS. Most of the impurities were synthesized and their assigned constitutions confirmed by co-injection in HPLC. We describe herein the formation, synthesis and characterization of these impurities. Our study will be of immense help to others to obtain chemically high pure azelnidipine.