Bifunctional organocatalysis with squaramide-containing Dawson organo-polyoxotungstates

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• 作者：David Lachkar^a ; Emmanuel Lacô ; te^a ; ^b ; ^{emmanuel.lacote@univ-lyon1.fr" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Polyoxometalates ; Homogeneous catalysis ; Hydrogen bonds ; Organocatalysis ; Organic&ndash ; inorganic hybrids
• 刊名：Comptes Rendus Chimie
• 出版年：2016
• 出版时间：January-February 2016
• 年：2016
• 卷：19
• 期：1-2
• 页码：113-116
• 全文大小：400 K

文摘

Two squaramide-containing organo-polyoxometalates (POMs) have been prepared, which efficiently catalyze the addition of dicarbonyl derivatives onto nitroolefins. The POM surface enhances the reactivity of the squaramide, and the hybrid acts as a bifunctional catalyst, where the highly charged POM surface in the organic medium is a base, which deprotonates the nucleophile and the squaramide activates the nitroalkenes via H-bonds. This opens new perspectives to POM-based catalysis.