The 1-(2-aminoethyl)aziridine (aziridine dimer) 1 reacts with acetylene dicarboxylates to give 1,4-diaza-5oxobicyclo[4.3.0]nonanes (7-azaindolizines) 3 together with the usual enamine adducts 4; the product structures are confirmed spectroscopically and, in the 3 also by X-ray diffraction and by an independent synthesis from furan 5.
R. G. Kostyanovsky, Y. I. El'natanov, I. I. Chervin, M. Y. Antipin and A. V. Ivanov, Mendeleev Commun., 1997, 7, 56 DOI: 10.1070/MC1997v007n02ABEH000708
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