The title compound 1a is prepared by a two-step sequence from the cycloadduct 5d, derived from di(tert-butyl) azodicarboxylate and the diene 4b by a hetero Diels-Alder reaction.
I. H. Aspinall, P. M. Cowley, G. Mitchell and R. J. Stoodley, J. Chem. Soc., Chem. Commun., 1993, 1179 DOI: 10.1039/C39930001179
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