Archiv der Pharmazie p. 411 - 417 (1992)
Update date:2022-09-26
Topics:
Herdeis
Engel
[4+2] Cycloadditions of various dienes 1 with the acceptor-subtituted imines 2 furnished the 4-oxo-piperidine-2.2-dicarboxylate derivatives 3, 5, 11, 12. All efforts to get the regio-isomeric 5-oxo-derivatives (Scheme 2) by variation of the reaction condi
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