Unexpected Temperature, Time and Solvent Effects in the Catalytic Asymmetric aza-Diels-Alder Reaction of an Ethyl Glyoxylate-derived<i>N</i>-Aryl Imine with Danishefsky’s Diene Catalysed by a BINOL-Zinc Complex
作者:Andrew Whiting、Stéphane Guillarme
DOI:10.1055/s-2004-817743
日期:——
The catalytic asymmetric aza-Diels-Alderreaction of an ethyl glyoxylate-derived N-aryl imine with Danishefsky'sdiene using a BINOL-zinc complex provides the corresponding cycloadduct with moderate to high enantioselectivity, depending on the solvent, temperature and reaction time.
Application of Zinc(II)–Binol for the Formal Aza-Diels–Alder Reaction ofN-Arylimines with Danishefsky's Diene: CD-Based Absolute Stereochemistry Determination, Origin of Asymmetric Induction and Mechanistic Considerations
作者:Lorenzo Di Bari、Stéphane Guillarme、John Hanan、Andrew P. Henderson、Judith A. K. Howard、Gennaro Pescitelli、Michael R. Probert、Piero Salvadori、Andrew Whiting
DOI:10.1002/ejoc.200700731
日期:2007.12
Zinc(II)–binol has been employed as an efficient Lewis acid catalyst (10 or 100 mol-% loading) for the formal aza-Diels–Alder reaction of ester, furyl and dimethyl acetal-substituted N-aryl imines. Asymmetric induction varies from poor to good, with the major enantiomer obtained being (S) when the (S)-binol complex has been employed. The absolutestereochemistry of the dimethyl acetal-substituted cycloaduct
Substituted piperidines as inhibitors of beta-secretase, cathepsin D, plasmepsin II and/or HIV protease
申请人:Speedel Experimenta AG
公开号:EP1958634A3
公开(公告)日:2008-09-24
Use of compounds of the general formula (I) or (II)
and pharmaceutically acceptable salt thereof, in which R, R1, R2, R3, R4, Q, W, X and Z, n and m have the definitions illustrated in detail in the description, as beta-secretase, cathepsin D, plasmepsin II and/or HIV protease inhibitors.
Substituted piperidines of formulae (I) and (II) with the substituent definitions as explained in the specification. The compounds are suitable in particular as renin inhibitors and are highly potent.