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).
A. I. Meyers, D. M. Stout and T. Takaya, J. Chem. Soc., Chem. Commun., 1972, 1260 DOI: 10.1039/C39720001260
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