An efficient [4 + 2 + 1] entry to seven-membered rings |
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| Authors: | Ni Yike Montgomery John |
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| Institution: | Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA. |
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| Abstract: | A new nickel-catalyzed procedure for the 4 + 2 + 1] cycloaddition of trimethylsilyl diazomethane with alkynes tethered to dienes has been developed. A broad range of unsaturated substrates participate in the sequence, and stereoselectivities are generally excellent. Three possible mechanisms are proposed, and each involves the generation of a transient nickel carbene species. |
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