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2. D. L. Boger and S. M.Weinreb, in Hetero Diels–Alder Methodology in Organic Synthesis, ed. H. Wasserman, Academic Press, San Diego, CA, 1987, vol. 47
3. Recent developments in imino Diels–Alder reactions
4. Stereoselective Aza-Diels-Alder Reactions