title: Synthesis and biological activities of optical isomers of 2-(4-diphenylmethyl-1-piperazinyl)ethyl 5-(4,6-dimethyl-2-oxo-1,3,2-dioxaphosphorinan-2-yl)-1,4-dihydro-2,6-dim ethyl-4-(3-nitrophenyl)-3-pyridinecarboxylate dihydrochloride (NIP-101).
abstract: Six optical isomers of 2-(4-diphenylmethyl-1-piperazinyl)ethyl 5-(4,6-dimethyl-2-oxo-1,3,2-dioxaphosphorinan-2-yl)-1,4-dihydro-2, 6-dimethyl-4-(3-nitrophenyl)-3-pyridinecarboxylate dihydrochloride (NIP-101, 1.2HCl.2H2O), a potent calcium antagonist, were successfully prepared by using optically active (2R,4R)-(-)- and (2S,4S)-(+)-2,4-pentanediols, and cis-2,4-pentanediol and optically active (S)-(+)-2-methoxy-2-phenylethanol. Their proton nuclear magnetic resonance investigations demonstrate that the 1,3,2-dioxaphosphorinane group is conformationally constrained around the C-P bond. Calcium-antagonistic and hypotensive activities of the optical isomers were examined and found to depend mainly on the absolute configuration at a stereogenic center in the 1,4-dihydropyridine ring rather than the configuration of the 1,3,2-dioxaphosphorinane moiety.
authors.affiliation: Central Research Institute, Nissan Chemical Ind. Co. Ltd., Chiba, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Sakoda
authors.forename: Y
authors.initials: Y
authors.lastname: Kamikawaji
authors.forename: K
authors.initials: K
authors.lastname: Seto
mesh_terms: D000818:Animals; D000959:Antihypertensive Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D002121:Calcium Channel Blockers / Q000138:chemical synthesis* / Q000494:pharmacology; D003498:Cyclic P-Oxides / Q000138:chemical synthesis* / Q000494:pharmacology; D009539:Nicotinic Acids / Q000138:chemical synthesis* / Q000494:pharmacology; D051381:Rats; D011918:Rats, Inbred SHR; D013237:Stereoisomerism
chemical_list: D000959:Antihypertensive Agents; D002121:Calcium Channel Blockers; D003498:Cyclic P-Oxides; D009539:Nicotinic Acids; C078304:NIP 101