Hetero Diels-Alder Type Reactions Between Danishefsky’s Dienes in the Presence of Lewis Base Catalysts. An Efficient Method for the Synthesis of Substituted 2,3-Dihydropyran-4-ones
作者:Teruaki Mukaiyama、Takayuki Kitazawa
DOI:10.3987/com-06-s(o)52
日期:——
Highly asymmetric hetero-Diels–Alder reaction using helical silica-supported Mn(III)-salen catalysts
作者:Le Li、Yu Li、Di Pang、Fei Liu、Aqun Zheng、Guangbin Zhang、Yang Sun
DOI:10.1016/j.tet.2015.08.045
日期:2015.10
Helical silica were prepared and functionalized by Mn(III)-salen complexes in order to catalyze asymmetric hetero-Diels Alder reactions. Characterizations revealed doping of sodium lactate facilitated porosity, hydrolysis resistance and chiral configuration of silica matrix. Catalysis revealed the combination of Mn(III)-salen with helical silica had excellent chiral induction. Major product configuration was affected by temperature and solvent. Loading imidazolium ionic liquid as solvent improved both enantioselectivity and catalyst recycling. (C) 2015 Elsevier Ltd. All rights reserved.