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Sequential silylcarbocyclization/silicon-based Cross-Coupling Reactions

Sequential silylcarbocyclization/silicon-based Cross-Coupling Reactions

Scott E Denmark, Jack Hung-Chang Liu

J Am Chem Soc. 2007 Mar 28;129(12):3737-44.

PMID: 17335205

Abstract:

A sequential rhodium-catalyzed silylcarbocyclization of enynes parlayed with a palladium-catalyzed, silicon-based cross-coupling reaction has been developed for the synthesis of highly substituted cyclopentanes. 1,6-Enynes reacted with benzyldimethylsilane in the presence of rhodium catalysts to afford five-membered rings bearing a (Z)-alkylidenylbenzylsilyl group. A variety of substitution patterns and heteroatom substituents were compatible. The silylcarbocyclization in which an unsaturated ester participated was also achieved. The resulting alkylidenylsilanes underwent palladium-catalyzed cross-coupling using tetra-n-butylammonium fluoride. This cross-coupling reaction displayed a broad substrate scope. A wide variety of substitution patterns, electronic properties, and heteroatoms were compatible. All of the cross-coupling reactions proceeded in high yields under very mild conditions and with complete retention of double bond configuration, resulting in densely functionalized 3-(Z)-benzylidenecyclopentanes and heterocycles.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1631705	Benzyldimethylsilane		1631-70-5	Price

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