Phase transfer catalyzed enantioselective cyclopropanation of 4-nitro-5-styrylisoxazoles
作者:Claudia Del Fiandra、Linda Piras、Francesco Fini、Paolo Disetti、Maria Moccia、Mauro F. A. Adamo
DOI:10.1039/c2cc30401e
日期:——
substituted cyclopropane esters were prepared in high yields, complete diastereoselection and high (up to 96%) enantioselectivity. The reaction described herein entailed reacting 4-nitro-5-styrylisoxazoles, a class of cinnamate synthetic equivalent, with 2-bromomalonate esters under the catalysis of 5 mol% of a Cincona derived phase-transfer catalyst. The reaction allowed multi-gram preparation of desired
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
An enantioselective 1,6-Michael addition reaction of arylthiols to a wide range of 3-methyl-4-nitro-5-alkenyl-isoxazoles catalyzed by readily available Takemoto's thiourea catalyst has been developed. This reaction provides a useful catalytic method for the synthesis of optically active chiral sulfur compounds bearing a 4-nitroisoxazol-5-yl moiety in high to excellent yields (up to 97%) and high enantioselectivities (up to 91% ee). Significantly, the potential utilities of the protocol had been further demonstrated by gram-scale reaction and the versatile conversions of some resulting products into other functionalized and useful compounds.