Asymmetric catalytic [4 + 1] annulations catalyzed by quinidine: enantioselective synthesis of multi-functionalized isoxazoline N-oxides
作者:Zhi-Wei Guo、Jian-Wu Xie、Ce Chen、Wei-Dong Zhu
DOI:10.1039/c2ob26165k
日期:——
multi-functionalized isoxazolineN-oxides with three stereogenic centers including adjacent quaternary and tertiary stereocenters has been developed. Notably, the unexpected product ethyl 2-((tert-butyldimethylsilyl)oxy)-2-(5,5-diacetyl-3-((methylsulfonyl)oxy)-4-phenylisoxazolidin-3-yl)acetate (8) bearing a quaternary stereocenter and two tertiary stereocenters was obtained from the undocumented 5,