Enantioselective Cascade Reaction of α-Cyano Ketones and Isatylidene Malononitriles: Asymmetric Construction of Spiro[4<i>H</i>-pyran-oxindoles]
作者:Jin Xie、Wei-Long Xing、Feng Sha、Xin-Yan Wu
DOI:10.1002/ejoc.201600432
日期:2016.8
α‐Cyano ketones have been used for the first time as Michael donors in the construction of chiral spiro compounds. In the presence of only 2 mol‐% of a chiral multifunctional organocatalyst, chiral spiro[4H‐pyran‐oxindole] derivatives were prepared in excellent yields with good‐to‐excellent enantioselectivities. This method provides a new approach to the synthesis of chiral spirocyclic oxindoles.
Bifunctional Squaramide-Catalyzed Asymmetric [3 + 2] Cyclization of 2-(1-Methyl-2-oxoindolin-3-yl)malononitriles with Unsaturated Pyrazolones To Construct Spirooxindole-Fused Spiropyrazolones
作者:Ye Lin、Bo-Liang Zhao、Da-Ming Du
DOI:10.1021/acs.joc.9b01268
日期:2019.8.16
The present paper reports a highlystereoselectivesynthesis of spirooxindole-fused spiropyrazolones through the asymmetric [3 + 2] cyclization reaction of 2-(1-methyl-2-oxoindolin-3-yl)malononitriles with unsaturated pyrazolones under mild conditions. With only a 1 mol % bifunctional squaramide catalyst, a series of chiral dispirocyclic pyrazolone derivatives were attained in high yields (85–97%)
An Efficient Construction of CF
<sub>3</sub>
‐Substituted Spirooxindole‐Fused Benzo[a]quinolizidines by a Three‐Component Cyclization
作者:Yijie Hu、Liufeiyang Ye、Jie Chen、Hui Zhang、Hongmei Deng、Jin‐Hong Lin、Weiguo Cao
DOI:10.1002/ejoc.202100809
日期:2021.8.13
Since benzo[a]quinolizidine is a key subunit in numerous natural products and pharmaceuticals, its synthesis has received attention. Described herein is a convenient three-component cyclization for the efficient construction of CF 3 -substituted spirooxindole-fused benzo[a]quinolizidines by using CF3 -propiolate as a building block. This attractive protocol may find great synthetic utility as CF 3
Organocatalytic enantioselective construction of multi-functionalized spiro oxindole dienes
作者:Xiao-Fei Huang、Ya-Fei Zhang、Zheng-Hang Qi、Nai-Kai Li、Zhi-Cong Geng、Kun Li、Xing-Wang Wang
DOI:10.1039/c4ob00545g
日期:——
A diastereo- and enantio-selective domino Michael-cyclization–tautomerization reaction of isatylidene malononitriles with α,α-dicyanoalkenes catalyzed by a cinchona alkaloid-derived bifunctional thiourea catalyst has been developed. A series of multi-functionalized spiro oxindole diene derivatives have been obtained in good to excellent yields (up to 97%) with good to excellent enantioselectivities (up to 96%) as well as good diastereoselectivities (up to 7.9 : 1). In addition, an anomalous temperature effect on the enantioselectivity has also been studied for this transformation.
Metal-Free Regioselective Oxa-Michael Approach to Access Spirooxindole-Fused Tetrahydrofuran/Tetrahydropyran through [3 + 2]/ [4 + 2] Spirocyclization of Methyleneindolinones with Haloalcohols
作者:Amol T. Savekar、Ramesh A. Gaikwad、Suresh B. Waghmode
DOI:10.1021/acs.joc.4c00659
日期:2024.7.5
An efficient one-pot metal-free, base-catalyzed method has been developed for the regioselective [3 + 2]/[4 + 2] annulation reactions of electrophilic methyleneindolinones with haloalcohols to furnish spirooxindole derivatives under mild reaction conditions. This reaction afforded the corresponding products with two contiguous stereocenters including a quaternary center in good to excellent yield (up
开发了一种高效的一锅法无金属碱催化方法,用于亲电子亚甲基二氢吲哚酮与卤代醇的区域选择性[3 + 2]/[4 + 2]环化反应,在温和的反应条件下提供螺吲哚衍生物。该反应以良好至优异的产率(高达 95%)提供具有两个连续立体中心(包括四元中心)的相应产物,具有中等至良好的非对映选择性(高达 12.5:1 dr )和完全区域选择性。