Organocatalytic [4 + 2] cyclocondensation of α,β-unsaturated acyl chlorides with imines: highly enantioselective synthesis of dihydropyridinone and piperidine derivatives
作者:Wen-Qiang Jia、Xiang-Yu Chen、Li-Hui Sun、Song Ye
DOI:10.1039/c4ob00114a
日期:——
alkaloid-catalyzed [4 + 2] cyclocondensation of α,β-unsaturated acyl chlorides with imines is developed to give the corresponding substituted dihydropyridinones in good yields with high to excellent enantioselectivities. Reduction of the dihydropyridinones gave highly optically active substituted tetrahydropyridinone and piperidine derivatives.
<i>N</i>-Heterocyclic Carbene-Catalyzed All Carbon-[4+2] Cyclocondensation of<i>α</i>,<i>β</i>-Unsaturated Acyl Chlorides with 3-Alkylenyloxindoles
作者:Litao Shen、Wenqiang Jia、Song Ye
DOI:10.1002/cjoc.201400411
日期:2014.8
AbstractAlthough the NHC‐catalyzed cyclization reactions have been well established for the synthesis of various heterocycles, the corresponding all carbon cyclization reaction for the synthesis of carbocycles is far less established. In this note, the NHC‐catalyzed all carbon [4+2] cyclocondensation of α,β‐unsaturated acyl chlorides and 3‐alkenyloxindoles was developed to give the corresponding spirocarbocyclic oxindoles in good yield with good to high diastereoselectivities.