Organocatalytic double arylation of 3-isothiocyanato oxindoles: Stereocontrolled synthesis of complex spirooxindoles
作者:Lin-Lin Zhang、Bing-Chao Da、Shao-Hua Xiang、Shuai Zhu、Zi-Yun Yuan、Zhen Guo、Bin Tan
DOI:10.1016/j.tet.2018.11.016
日期:2019.3
employed as the electrophiles for the organocatalyticMichael addition/cyclization cascade reaction with versatile 3-isothiocyanato oxindoles. Chiral bifunctional organocatalyst was appropriate for this enantioselective transformation to afford a variety of novel spirooxindoles, possessing a spirocyclic stereocenter adjacent to the aromatic ring, via asymmetricdouble arylation. These synthesized spirooxindoles
A Mannich/cyclization cascade process for the asymmetric synthesis of spirocyclic thioimidazolidineoxindoles
作者:Hao Cai、Yu Zhou、Dong Zhang、Jinyi Xu、Hong Liu
DOI:10.1039/c4cc06000h
日期:——
An asymmetric cascade Mannich/cyclization reaction between 3-isothiocyanato-oxindoles and sulfimides has been developed for the synthesis of spirocyclic thioimidazolidineoxindoles.
3-Isothiocyanato Oxindoles Serving as Powerful and Versatile Precursors to Structurally Diverse Dispirocyclic Thiopyrrolidineoxindoles through a Cascade Michael/Cyclization Process with Amino-Thiocarbamate Catalysts
Cascading catalysis: 3‐Isothiocyanato oxindoles act as powerful and versatile precursors for a range of structurally diverse dispirocyclic thiopyrrolidineoxindoles containingtwospiro‐quaternary and threecontiguous stereogenic centers in quantitative yields with excellent disatereo‐ and enantioselectivities by only using 1 mol % amino‐thiocarbamate catalyst.
An efficient asymmetric dearomative [3+2] cycloadditionreaction of 2‐nitroindoles and 2‐nitrobenzothiophenes with 3‐isothiocyanato oxindoles was developed by using a chiral Zn(OTf)2/bis(oxazoline) complex as a catalyst. With the developed protocol, a range of enantioenriched complex heterocyclic compounds containing three contiguous stereocenters, one of which is spirocyclic center, could be obtained
Catalytic Asymmetric Michael Addition/Cyclization Cascade Reaction of 3-Isothiocyanatooxindoles with Nitro Olefins
作者:Satavisha Kayal、Santanu Mukherjee
DOI:10.1002/ejoc.201402534
日期:2014.10
asymmetric reaction of 3-isothiocyanatooxindoles with nitroolefins has been developed by using a cinchonidine-derived bifunctional catalyst. The resulting products, highly functionalized 3,2-pyrrolidinyl-substituted spirooxindole derivatives, were obtained in high yields with good diastereo- and enantioselectivities (up to dr >20:1 and er = 96:4). This Michael addition/cyclization cascade reaction employs
3-异硫氰酸根合吲哚与硝基烯烃的第一个有机催化不对称反应是通过使用辛可尼丁衍生的双功能催化剂开发的。所得产物是高度官能化的 3,2-吡咯烷基取代的螺吲哚衍生物,以高产率获得,具有良好的非对映选择性和对映选择性(高达 dr > 20:1 和 er = 96:4)。这种迈克尔加成/环化级联反应使用单取代的硝基烯烃,并补充了 Zn-II 催化的变体,后者仅适用于二取代的硝基烯烃。