Asymmetric Construction of Remote Vicinal Quaternary and Tertiary Stereocenters via Direct Doubly Vinylogous Michael Addition
作者:Subhrajit Rout、Harshit Joshi、Vinod K. Singh
DOI:10.1021/acs.orglett.8b00493
日期:2018.4.20
An asymmetric direct doubly vinylogousMichaeladdition has been developed for the generation of sterically congested vicinal quaternary and tertiary stereocenters. This doubly vinylogousMichaeladdition of β,γ-unsaturated butenolides to 3-methyl-4-nitro-5-alkenyl isoxazoles, powered by a bifunctional squaramide, affords a broad range of densely functionalized enantioenriched γ,γ-disubstituted butenolides
1,3-Dipolar cycloaddition enabled isoxazole-fused spiropyrrolidine oxindoles syntheses from 3-methyl-4-nitro-5-alkenyl-isoxazoles and azomethine ylides
作者:Xiong-Wei Liu、Zhen Yao、Jun Yang、Zhi-Yong Chen、Xiong-Li Liu、Zhi Zhao、Yi Lu、Ying Zhou、Yu Cao
DOI:10.1016/j.tet.2016.01.029
日期:2016.3
A facile and efficient methodology was developed for the synthesis of isoxazole-fused spiropyrrolidine oxindoles 3–5 via a 1,3-dipolarcycloaddition reaction of 3-methyl-4-nitro-5-alkenyl-isoxazoles with azomethine ylides (thermally generated in situ from isatin derivatives and proline or thioproline or sarcosine). Products bearing adjacent quaternary-tertiary centers were smoothly obtained in high
efficient method for the enantioselective 1,6-Michael addition reaction of anthrone to a series of 3-methyl-4-nitro-5-alkenyl-isoxazoles with a bifunctional thiourea-tertiary amine as catalyst is described. This transformation proceeds smoothly with 10 mol % catalyst and provides a series of Michael adducts bearing 3-methyl-4-nitro-isoxazole and anthrone units with good to high enantioselectivities (up
Design, synthesis, and biological evaluation of nitroisoxazole-containing spiro[pyrrolidin-oxindole] derivatives as novel glutathione peroxidase 4/mouse double minute 2 dual inhibitors that inhibit breast adenocarcinoma cell proliferation
作者:Shuai-Jiang Liu、Qian Zhao、Cheng Peng、Qing Mao、Fengbo Wu、Feng-Hua Zhang、Quan-Sheng Feng、Gu He、Bo Han
DOI:10.1016/j.ejmech.2021.113359
日期:2021.5
(GPX4)/mouse double minute 2 (MDM2) dual inhibitors. Bioactive spirooxindole and isoxazole skeletons were combined, and the resulting compounds exhibited strong activities against both targets. In particular, compound 3d displayed excellent activity in the suppression of MDM2-mediated degradation of p53, as well as levels of GPX4, in MCF-7 breast cancercells. Moreover, 3d also exhibited inhibitory
Highly diastereoselective assembly of isoxazole and trifluoromethyl containing spiro[pyrrolidin-oxindoles] from N-2,2,2-trifluoroethyl-substituted isatin imines and styrylisoxazoles
The highly diastereoselective 1,3-dipolar cycloaddition reaction of N-2,2,2-trifluoroethyl-substituted isatin imines with styrylisoxazoles was developed for the synthesis of a wide range of isoxazole- and trifluoromethyl-containing spiro[pyrrolidin-oxindoles] in high yields with excellent diastereoselectivities. Further transformations of the final products and the gram-scale capacity of this method