Regioselective synthesis of pyridines and dihydropyridines derived from β-amino acids and aminophosphonates by reaction of N-vinylic phosphazenes with α, β- …
Reaction of N-vinylic phosphazenes with α, β-unsaturated ketones leads to the formation of pyridines derived from β-amino acids in a regioselective fashion. The use of functionalized enones derived from α-acylstyryl-carboxylates or-phosphonates affords biologically active asymmetrical and symmetrical dihydropyridines substituted with carboxylate or phosphonate groups including nitrendipine, felodipine, MRS 1097, and efonidipine analogs.