It all adds up: The activation of aromatic isoxazoles with a nitro group at the 4‐position has enabled the first regio‐ and diastereoselective trifluoromethylation at the 5‐position of isoxazoles by nucleophilic addition using Me3SiCF3 (see scheme; DMF=N,N′‐dimethylformamide). The process was demonstrated with a broad range of 3,5‐aromatic, heteroaromatic and aliphatic substrates.
所有这些加起来:在4位上带有硝基的芳香异恶唑的活化,使得能够通过Me 3 SiCF 3的亲核加成在异恶唑的5位上进行第一次区域和非对映选择性的三氟甲基化(参见方案; DMF = N ,N'-二甲基甲酰胺)。广泛的3,5-芳族,杂芳族和脂族底物都证明了该方法。
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
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
Catalytic enantioselective addition of isocyanoacetate to 3-methyl-4-nitro-5-styrylisoxazoles under phase transfer catalysis conditions
作者:Paolo Disetti、Maria Moccia、Diana Salazar Illera、Surisetti Suresh、Mauro F. A. Adamo
DOI:10.1039/c5ob01880c
日期:——
The reaction between 3-methyl-4-nitro-5-styrylisoxazoles and ethyl isocyanoacetate proceeded under phasetransfercatalysis to give enantioenriched monoadducts in high enantiomeric excess (up to 99% ee). The resulting adducts were subsequently cyclised to give 2,3-dihydropyrroles and substituted pyrrolidines in identical high ees and as a single diastereoisomer.
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