Direct and Stereoselective Alkylation of Nitro Derivatives with Activated Alcohols in Trifluoroethanol
作者:Diego Petruzziello、Andrea Gualandi、Stefano Grilli、Pier Giorgio Cozzi
DOI:10.1002/ejoc.201201345
日期:2012.12
benzylic, benzhydrylic, and propargylic alcohols in trifluoroethanol. A variety of different nitroalkanes bearing functional groups can be used in this SN1-typereaction to afford the desired products in quantitative yields. Different chiral nitro derivatives were submitted to this highly diastereoselective alkylation reaction with selected benzhydrols. A new, effective, and chiral pyrrolidine organocatalyst
A Rational Approach Towards a New Ferrocenyl Pyrrolidine for Stereoselective Enamine Catalysis
作者:Diego Petruzziello、Marco Stenta、Andrea Mazzanti、Pier Giorgio Cozzi
DOI:10.1002/chem.201300959
日期:2013.6.10
and pyrrolidine derivatives (Hayashi– Jørgensen catalysts) are considered “work horses” in organocatalysis. This report describes a new effective ferrocenylpyrrolidine catalyst that is able to perform well in benchmark organocatalytic reactions (see figure). The ferrocene moiety controls the conformational space and a simple alkyl group effectively covers a face of the derived enamine. This new framework
The ability of intermolecular cooperative thiourea/oxime hydrogen-bond catalysis for improving and accelerating asymmetric aminocatalysis is disclosed. The two readily available hydrogen-bond-donating catalysts operate in synergy with a chiral amine catalyst to accomplish a plethora of highly stereoselective transformations.