Cyclization−Cycloaddition Cascade of Rhodium Carbenoids Using Different Carbonyl Groups. Highlighting the Position of Interaction
作者:Albert Padwa、Zhijia J. Zhang、Lin Zhi
DOI:10.1021/jo000378f
日期:2000.8.1
carboxylate, were found to afford oxabicyclic dipolar cycloadducts derived by the trapping of a carbonylylide intermediate. The reaction involves generation of the 1,3-dipole by intramolecular cyclization of the keto carbenoid onto the oxygen atom of the neighboring keto group. Both five- and six-ring carbonylylides are formed with the same efficiency. A study of the tandem cyclization-cycloaddition