Nuclear synthesis of 1,4-dihydropyridines by rearrangement of aziridinobicyclo[2,2,1]pyridazine carboxylates

Abstract
The adducts of cyclopentadiene and azodicarboxylate esters were treated with benzenesulphonyl azide producing the fused aziridine derivatives, (4) and (5); hydrolysis of the ethyl ester (4) gave the diazatricylene (7) whereas hydrolysis of the t-butyl ester led to the dihydropyridine (9).

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