- Pericyclic reaction of ketenes with cascade reaction products of pyridine N-oxides and dipolarophiles. X-ray structures of the adducts and formation mechanism.
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The structures of the adducts derived from the reactions of substituted ketenes with dihydropyridine derivatives have been clarified by single crystal X-ray analyses and the formation mechanism is discussed on the basis of the reaction-path calculations by semiempirical and density functional theory (DFT) molecular orbital methods.
- Oiso, Shigeru,Eto, Masashi,Yoshitake, Yasuyuki,Harano, Kazunobu
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- Synthesis of phosphonobenzocarbacephems by intramolecular radical cyclization of haloaryl-substituted β-lactams
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A series of benzo-fused tricyclic β-lactams, most of them phosphonobenzocarbacephems, were prepared in a straightforward way starting from phosphonoazadienes. In this paper, the synthetic route including a Staudinger reaction towards the β-lactams, followed by radical ring closing with tributyltin hydride and AIBN, which resulted in the envisaged tricyclic compounds, is reported.
- Van Der Jeught, Sarah,Masschelein, Kurt G. R.,Stevens, Christian V.
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experimental part
p. 1333 - 1338
(2010/04/29)
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- Stereoselective synthesis of highly functionalised tricyclic β-lactams via intramolecular nitrilimine cycloaddition
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The novel azeto[2′,1′:1,2]pyrrolo[3,4-c]pyrazole skeleton has been obtained in both racemic and enantiopure forms by means of intramolecular cycloaddition of nitrilimines 6. Fully stereoselective cycloadditions were obtained, giving tricyclic β-lactams 7
- Del Buttero, Paola,Molteni, Giorgio
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p. 1319 - 1321
(2007/10/03)
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