Catalytic Asymmetric Construction of Spirocycles Containing Pyrrolidine Motifs and Spiro Quaternary Stereogenic Centers via 1,3-Dipolar Cycloaddition of Azomethine Ylides with 2-Alkylidene-Cycloketones
作者:Tang-Lin Liu、Zhao-Lin He、Qing-Hua Li、Hai-Yan Tao、Chun-Jiang Wang
DOI:10.1002/adsc.201100104
日期:2011.7
The first catalyticasymmetric 1,3‐dipolar cycloaddition of azomethineylides with various sterically hindered α,α,β‐trisubstituted 2‐alkylidene‐cycloketones has been developed successfully with silver acetate/TF‐BiphamPhos complex for the construction of spiro heterocyclic compounds containingpyrrolidine motifs and a spiro quaternary stereogenic carbon center. The highly efficient catalytic system exhibited