Highly asymmetric hetero-Diels-Alder reaction using helical silica-supported Mn(III)-salen catalysts

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• 作者：Le Li^a ; Yu Li^a ; Di Pang^b ; Fei Liu^b ; Aqun Zheng^a ; Guangbin Zhang^c ; Yang Sun^a ; ^{sunyang79@mail.xjtu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Helical silica ; Mn(III)-salen ; Immobilization ; Hetero-Diels&ndash ; Alder
• 刊名：Tetrahedron
• 出版年：2015
• 出版时间：21 October 2015
• 年：2015
• 卷：71
• 期：42
• 页码：8096-8103
• 全文大小：1235 K

文摘

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.