Tandem Nazarov Cyclization-Michael Addition Sequence Catalyzed By An Ir(Iii) Complex

Mesfin Janka,Wei He,Inga E. Haedicke,Frank R. Fronczek,Alison J. Frontier,Richard Eisenberg

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY（2006）

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摘要

The first examples of a tandem Nazarov cyclization/Michael addition process are described. The sequence is efficiently catalyzed by Ir[Me(CO)(dppe)(DIB)]2+ and occurs with high diastereoselectivity, creating three contiguous stereocenters. The mechanistic factors controlling the reactivity and diastereoselectivity are discussed.

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addition reactions

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