A diastereodivergentasymmetric Michael-alkylation reaction between 3-chloro-oxindoles and β,γ-unsaturated-α-ketoesters has been achieved using L-RaPr2/Sc(OTf)3 and L-PrPr2/Mg(OTf)2 metal complexes as catalysts. Both rel-(1R,2S,3R) and rel-(1S,2S,3R) chiral spiro cyclopropane oxindoles were constructed in good yields, diastereoselectivities and ee values. The diastereodivergent control may originate
Construction of Spirocyclopropane-Linked Heterocycles Containing Both Pyrazolones and Oxindoles through Michael/Alkylation Cascade Reactions
作者:Jun-Hua Li、Ting-Fan Feng、Da-Ming Du
DOI:10.1021/acs.joc.5b01940
日期:2015.11.20
diastereoselective Michael/alkylation cascade reaction of arylidenepyrazolones with 3-chlorooxindoles catalyzed by DIPEA was developed. A variety of highly functionalized spiro-pyrazolone-cyclopropane-oxindoles were obtained in excellent yields (up to 99%) with good to excellent diastereoselectivities (up to >25:1 dr). Moreover, the squaramide-catalyzed asymmetric reactions of arylidenepyrazolones with
Squaramide-catalysed asymmetric cascade reactions of 2,3-dioxopyrrolidines with 3-chlorooxindoles
作者:Jiang-Bo Wen、Da-Ming Du
DOI:10.1039/c9ob02663k
日期:——
A highly efficient method for the enantioselective construction of dispirocyclic compounds has been developed by the squaramide-catalysed asymmetricMichaeladdition/cyclizationcascadereaction of 2,3-dioxopyrrolidines with 3-chlorooxindoles. The corresponding chiral dispiro[indoline-3,1'-cyclopropane-2',3''-pyrrolidine]-2,4'',5''-triones were obtained in high yields with excellent stereoselectivities
Catalytic Asymmetric [4+1] Cyclization of <i>ortho</i>
-Quinone Methides with 3-Chlorooxindoles
作者:Xiao-Li Jiang、Si-Jia Liu、Yu-Qi Gu、Guang-Jian Mei、Feng Shi
DOI:10.1002/adsc.201700487
日期:2017.10.4
In this work, we established catalyticasymmetric [4+1] cyclization of ortho‐quinone methides (o‐QMs) with 3‐chlorooxindoles and a catalyticasymmetric domino oxidation/[4+1] cyclization reaction of 2‐alkylphenols with 3‐chlorooxindoles, which constructed a spirooxindole‐based 2,3‐dihydrobenzofuran scaffold in good yield (up to 97%), with excellent diastereoselectivity (up to >95:5 dr) and high enantioselectivity
SO<sub>2</sub>ClF: A Reagent for Controllable Chlorination and Chlorooxidation of Simple Unprotected Indoles
作者:Tianting Ma、Yu Zheng、Shenlin Huang
DOI:10.1021/acs.joc.3c00039
日期:——
Sulfuryl chlorofluoride was first employed as a versatile reagent for controllable chlorination and chlorooxidation of simple unprotected indoles. Three types of products including 3-chloro-indoles, 3-chloro-2-oxindoles, and 3,3-dichloro-2-oxindoles could be selectively obtained in good to excellent yields by switching the reaction solvents. The present method features easy-to-operate, broad substrate