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 catalytic asymmetric 1,3‐dipolar cycloaddition of azomethine ylides 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 containing pyrrolidine motifs and a spiro quaternary stereogenic carbon center. The highly efficient catalytic system exhibited
已成功开发了乙酸银/ TF-BiphamPhos配合物成功开发出具有各种空间受阻α,α,β-三取代的2-亚烷基-环酮的偶氮甲亚胺的第一个催化不对称的1,3-偶极环加成反应,用于构建含吡咯烷的螺杂环化合物图案和螺旋四元立体立体碳中心。高效催化体系在温和条件下表现出高反应活性,出色的非对映选择性,良好的对映选择性和广泛的底物范围。随后的转化导致方便地制备合成有用的螺[吡咯烷-四氢吡喃酮]和螺[吡咯烷-异色喃-1-酮],而不会损失非对映异构体和对映体过量。