Polycyclic 1,4-dihydrobenzothieno[3,2-b]pyridine 5,5-dioxides and 4,5-dihydro-1H-indeno[1,2-b]pyridines having ester or cyano group at the position 3 of dihydropyridine ring have been synthesised. Reactivity of N-bromosuccinimide (NBS) towards polycyclic 1,4-dihydropyridine derivatives has been investigated. It has been found that 1,4-dihydrobenzothieno[3,2-b]pyridine 5,5-dioxides are easily oxidised...
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