Cover Picture Organocatalytic Asymmetric Inverse-Electron-Demand Aza-DielsЦAlder Reaction of N-Sulfonyl-1-aza-1 3-butadienes and Aldehydes (Angew. Chem. Int. Edкод для вставкиСкачать
D 3461 International Edition www.angewandte.org 2008–47/51 Sugar Biosynthesis H.-w. Liu et al. [2.2]Paracyclophanes H. Hopf Atmospheric Chemistry J. Lelieveld ACIEFS 47 (51) 9783–9998 (2008) · ISSN 1433–7851 · Vol. 47 · No. 51 Cover Picture Bo Han, Jun-Long Li, Chao Ma, Shan-Jun Zhang, and YingChun Chen* The inverse-electron-demand aza Diels–Alder reaction of N-sulfonyl-1-aza-1,3butadienes and aldehydes shown in the cover picture is explored through catalysis by an a,a-diphenylprolinol OTMS ether salt. In their Communication on page 9971 ff., Y.-C. Chen and co-workers show how this simple process affords highly enantioenriched hemiaminal intermediates, which are readily converted into a diversity of chiral piperidine derivatives. [2.2]Paracyclophanes H. Hopf describes applications of [2.2]paracyclophanes as monomers in his Minireview on page 9808 ff. Their layered structure can be retained or destroyed in novel polymers, and they can be used to prepare unsaturated molecular scaffolds. Sugar Biosynthesis Many natural products derive their biologically activity from sugar substituents; modification of the sugar structure can alter the properties of the parent compound. In their Review on page 9814 ff., H.-w. Liu et al. describe current research in glycodiversification. Radical Reactivity The use Fourier transform ion cyclotron resonance mass spectrometery to investigate the reactivity of the s,s,s-triradical 3,4,5-tridehydropyridinium cation is described by J. J.Nash, H. I. Kenttmaa, and co-workers in their Communication on page 9860 ff.