Structurally Defined Molecular Hypervalent Iodine Catalysts for Intermolecular Enantioselective Reactions
作者:Stefan Haubenreisser、Thorsten H. Wöste、Claudio Martínez、Kazuaki Ishihara、Kilian Muñiz
DOI:10.1002/anie.201507180
日期:2016.1.4
Molecular structures of the most prominent chiral non‐racemic hypervalent iodine(III) reagents to date have been elucidated for the first time. The formation of a chirally induced supramolecular scaffold based on a selective hydrogen‐bonding arrangement provides an explanation for the consistently high asymmetric induction with these reagents. As an exploratory example, their scope as chiral catalysts
A New and Facile Method for Stereoselective Synthesis of (<i>E</i>)-Styryl Bromides by the Reduction of 1,1-Dibromoalkenes Using LiAlH<sub>4</sub>-EtOAc (1:1)
A facile method for stereoselectivesynthesis of (E)-styryl bromides by the reduction of 1,1-dibromoalkenes using LiAlH 4 -EtOAc (1:1) is described. We believe that the present procedure is a good alternative to the Tokuda's microwave method with good stereoselectivity.
Enantioselective Metal-Free Diamination of Styrenes
作者:Caren Röben、José A. Souto、Yolanda González、Anton Lishchynskyi、Kilian Muñiz
DOI:10.1002/anie.201103077
日期:2011.9.26
Metal‐free and asymmetric: The first enantioselectivediamination of styrenes simply requires a chiral hypervalent iodine(III) reagent as an oxidant and bismesylimide as a nitrogen source (see scheme, Ms=methanesulfonyl). The reaction proceeds under mild conditions and with high enantiomeric excess.
An enantioselective catalytic vicinal diamination of styrenes is reported, which proceeds under entirely intermolecular reaction control. It relies on a chirally modified aryliodine(I) catalyst and proceeds within an iodine(I/III) manifold with conventional 3-chloroperbenzoic acid as a terminal oxidant. An environmentally benign solvent combination not only adds to the attractiveness of the process
[EN] 4-OXO-1-(3-SUBSTITUTED PHENYL-1,4-DIHYDRO-1,8-NAPHTHYRIDINE-3-CARBOXAMIDE PHOSPHODIESTERASE-4 INHIBITORS<br/>[FR] 4-OXO-1-(PHENYL-1,4-DIHYDRO-1,8-NAPTHYRIDINE-3-CARBOXAMIDE, A SUBSTITUTION EN 3, UTILES COMME INHIBITEURS DE PHOSPHODIESTERASE-4
申请人:MERCK FROSST CANADA INC
公开号:WO2004048374A1
公开(公告)日:2004-06-10
Compounds represented by Formula (I):or a pharmaceutically acceptable salt thereof, are phosphodiesterase 4 inhibitors useful in the treatment of asthma and inflammation and useful for the enhancement of cognition.