S. Padmanabhan et al., SYNTHESIS AND BINDING-PROPERTIES OF 2H-1-BENZOPYRAN-2 ONE FLUOROPHORE-LINKED CALCIUM-CHANNEL ANTAGONIST NIFEDIPINE (1,4-DIHYDROPYRIDINE) ANALOGS, Journal of heterocyclic chemistry, 34(1), 1997, pp. 301-304
Nifedipine analogs I, II and III with the 2H-1-benzopyran-2-one (couma
rin) fluorophore linked at the 2, 2 and 6 and 4 positions of the dihyd
ropyridine ring were synthesized by the modified Hantzch condensation
procedures. Attempts to synthesize dihydropyridine with the fluorophor
e at position 3 (IV) were unsuccessful.