1,3-Dipolar Cycloaddition of Azomethine Ylides Involving 3-Aminooxindoles: Versatile Construction of Dispiro[pyrrolidine-2,3′-oxindole] Scaffolds
作者:Qian Wei、Guodong Zhu、Hailei Zhang、Jingping Qu、Baomin Wang
DOI:10.1002/ejoc.201601127
日期:2016.11
A three-component [3+2] cycloaddition involving 3-aminooxindoles, aldehydes, and methyleneindolinone derivatives for the synthesis of dispiro[pyrrolidine-2,3′-oxindole] derivatives was developed. This reaction involves the use of readily available starting materials and mild reaction conditions. It displays broad functional-group tolerance and provides the products in high yields with good to excellent
Diastereoselective Synthesis of Functionalized Spirocyclopropyl Oxindoles via P(NMe<sub>2</sub>)<sub>3</sub>-Mediated Reductive Cyclopropanation
作者:Rong Zhou、Changjiang Yang、Yiyi Liu、Ruifeng Li、Zhengjie He
DOI:10.1021/jo502106c
日期:2014.11.7
A P(NMe2)3-mediated reductive cyclopropanation reaction of α-keto esters or amides with isatin-derivedalkenes has been developed, providing efficient and diastereoselective synthesis of highly functionalized spirocyclopropyl oxindoles bearing two all-carbon quaternary centers. This reaction also represents a complementary and nonmetal-involving protocol for the challenging cyclopropanation of electron-deficient
Highly Efficient and Stereoselective Construction of Bispirooxindole Derivatives via a Three-Component 1,3-Dipolar Cycloaddition Reaction
作者:Qin Xu、De Wang、Yin Wei、Min Shi
DOI:10.1002/open.201402003
日期:2014.6
A highly regio‐ and stereoselective synthesis of bispirooxindoles by 1,3‐dipolar cycloaddition of in situ generated azomethine ylides from isatin and proline to different electron‐deficient alkenes has been developed. The synthesis affords the desired bispiro scaffold compounds in excellent yields with high regioselectivity under mild conditions. The stereochemistry was determined by single‐crystal
Asymmetric Synthesis of 3,3′-Spirooxindoles Fused with Cyclobutanes through Organocatalytic Formal [2 + 2] Cycloadditions under H-Bond-Directing Dienamine Activation
作者:Liang-Wen Qi、Yu Yang、Yong-Yuan Gui、Yong Zhang、Feng Chen、Fang Tian、Lin Peng、Li-Xin Wang
DOI:10.1021/ol503266q
日期:2014.12.19
The first organocatalytic asymmetric synthesis of a spirooxindole skeleton incorporated with a cyclobutane moiety has been successfully developed on the basis of H-bond-directing dienamine activation. Structurally complex spirocyclobutyl oxindoles, which possess four contiguous stereocenters, including one spiro quaternary center, were obtained in good yields (up to 83%) with excellent β,γ-regioselectivity
Three-component [3 + 2] cycloaddition for regio- and diastereoselective synthesis of spirooxindole-pyrrolidines
作者:Xiaofeng Zhang、Miao Liu、Desheng Zhan、Manpreet Kaur、Jerry P. Jasinski、Wei Zhang
DOI:10.1039/d1nj05538k
日期:——
1,3-Dipolar cycloaddition of nonstabilized azomethine ylides derived from α-C–H functionalization of tetrahydroisoquinoline for regio- and diastereoselectivesynthesis of spirooxindole-pyrrolidines is developed. A three-component reaction of readily available cyclic amines, aryl aldehydes, and olefinic oxindoles provides a pot, atom and step economy (PASE) approach for preparing spiro-heterocyclic