作者:Łukasz Albrecht、Gustav Dickmeiss、Fabio Cruz Acosta、Carles Rodríguez-Escrich、Rebecca L. Davis、Karl Anker Jørgensen
DOI:10.1021/ja211878x
日期:2012.2.8
concept in organocatalysis allowing for the construction of cyclobutanes with four contiguous stereocenters with complete diastereo- and enantiomeric control by a formal [2 + 2]-cycloaddition is presented. The concept is based on simultaneous dual activation of α,β-unsaturated aldehydes and nitroolefins by amino- and hydrogen-bonding catalysis, respectively. A new bifunctional squaramide-based aminocatalyst