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J Am Chem Soc. 2010 Mar 3;132(8):2532-3. doi: 10.1021/ja910696x.

A metal-catalyzed intermolecular [5+2] cycloaddition/Nazarov cyclization sequence and cascade.

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  • 1Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA. wenderp@stanford.edu

Abstract

The bicyclo[5.3.0]decane skeleton is one of the most commonly encountered bicyclic subunits in nature and the core scaffold of a wide range of targets of structural, biological, and therapeutic importance. Prompted by the interest in such structures, we report the first studies of metal-catalyzed [5+2] cycloadditions of vinylcyclopropanes (VCPs) and enynones. The resultant efficiently formed dienone cycloadducts serve as substrates for subsequent Nazarov cyclizations and as intermediates for single-operation [5+2]/Nazarov serial reactions and catalytic cascades. In many cases the one-flask process can be carried out in shorter reaction times and with comparable or superior yields to the two-flask procedure. Significantly, a single catalyst can be used to mediate both transformations. These [5+2]/Nazarov reaction sequences and cascades collectively provide strategically novel and facile access to the bicyclo[5.3.0]decane skeleton from simple and readily available components.

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