Novel Rhodium-Catalyzed Cycloisomerization of 1,6-Enynes with an Intramolecular Halogen Shift
摘要:
A new Rh-catalyzed 1,6-enyne cycloisomerization process with a pi-allyl rhodium species as the key intermediate is investigated. A halogen shift happened in this novel process. The synthesis of stereodefined alpha-halomethylene gamma-butyrolactones has been achieved using the readily accessible Rh catalysts.
A palldium(0)-catalyzed tandem cyclization/Suzuki coupling reaction of various 1,6-enyne substrates was developed. This Pd-catalyzed enyne cyclization reaction represents a new process for the synthesis of stereodefined α-arylmethylene-γ-butyrolactones, lactams, multifunctional tetrahydrofurans, pyrrolidines, and cyclopentanes. The mechanism of the reaction was studied by the employment of different
Palladium-Catalyzed Tandem Cyclization/Suzuki Coupling of 1,6-Enynes
作者:Gangguo Zhu、Zhaoguo Zhang
DOI:10.1021/ol035304f
日期:2003.10.1
[reaction: see text] A Pd(0)-catalyzed 1,6-enyne cyclization-arylation cascade reaction was effected via pi-allylpalladium intermediate formation and subsequent Suzuki coupling to give cyclic products with stereodefined exocyclic double bonds.