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- W2949089553 abstract "The preparation of 2-(4-phenyl)butadienyl-piperidine 5 is described. An intramolecular Diels-Alder reaction of the intermediately formed fumaramide thereof produces stereoselectively the tricyclic lactam 6. Its structure, as well as the configurational relationship of its 5 asymmetric centers, is corroborated on the basis of the NMR.-data. Cycloacylation of the thermodynamically stable precursors 13 and 20 leads to pentacyclic aza- or diaza-steroid type skeletons. Their structures (14, 16, and 21) and in particular their relative configurations are elaborated. A few qualitative kinetic aspects of this intramolecular (4+2)-cycloaddition are presented." @default.
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- W2949089553 date "1973-09-25" @default.
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- W2949089553 title "ChemInform Abstract: INTRAMOLECULAR DIELS-ALDER-REACTIONS, CONSTRUCTION OF AZA- AND DIAZA-STEROID TYPE SKELETONS" @default.
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- W2949089553 doi "https://doi.org/10.1002/chin.197339260" @default.
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