2-Isoxazoline derivatives. Part V. Regio- and stereo-selectivity in the cycloaddition of benzonitrile oxide to some cycloalkene and 2-isoxazoline derivatives
作者:G. Bianchi、C. De Micheli、R. Gandolfi
DOI:10.1039/p19720001711
日期:——
The oxime-like CN bond of 2-isoxazolines undergoes 1,3-dipolar cycloaddition with benzonitrile oxide leading to new heterocyclic systems. The structures of the cycloadducts from benzonitrile oxide and cyclohexene systems have been established by spectral analysis and chemical evidence.
Iminoxyl Radical-Promoted Oxycyanation and Aminocyanation of Unactivated Alkenes: Synthesis of Cyano-Featured Isoxazolines and Cyclic Nitrones
作者:Fei Chen、Fei-Fei Zhu、Man Zhang、Rui-Hua Liu、Wei Yu、Bing Han
DOI:10.1021/acs.orglett.7b00826
日期:2017.6.16
oxidant, CuCN as the commercially available cyanating reagent, and pentamethyldiethylenetriamine (PMDETA) as the ligand. By using this protocol, a series of useful cyano-featured isoxazolines and cyclicnitrones were efficiently prepared.
Rhodium(<scp>iii</scp>)-catalyzed annulation of arenes with alkynes assisted by an internal oxidizing N–O bond
作者:Zisong Qi、Guo-Dong Tang、Cheng-Ling Pan、Xingwei Li
DOI:10.1039/c5ob01886b
日期:——
Rh(III)-catalyzedC–Hactivation of 3-aryl-dihydroisoxazoles in the coupling with diarylacetylenes has been developed under redox-neutral conditions. This reaction occurred under mild conditions with no by-product, and the N–O bond functions as an oxidizing directinggroup, leading to efficient synthesis of isoquinolines functionalized with a proximal secondary alcohol.
Palladium catalyzed C–H bond acetoxylation: isoxazolinyl as a directing group
作者:Caiwei Geng、Minghui Jiang、Lifei Feng、Peng Jiao
DOI:10.1039/c6ra07793e
日期:——
Pd(OAc)2-catalyzed acetoxylations of 3-aryl or 3-alkyl groups mounted on a 2-isoxazoline ring were studied. Ortho-selective C–H bond activation directed by an isoxazolinyl group was realized. 2-Isoxazoline rings without and with one or two alkyl substituents in the 5-position were effective directing groups. The substituent effect on reactivity and regioselectivity was examined. The acetoxylation was applied
Design, Synthesis, and Biological Evaluation of Nonsteroidal Cycloalkane[<i>d</i>]isoxazole-Containing Androgen Receptor Modulators
作者:Pekka K. Poutiainen、Tuomas Oravilahti、Mikael Peräkylä、Jorma J. Palvimo、Janne A. Ihalainen、Reino Laatikainen、Juha T. Pulkkinen
DOI:10.1021/jm300233k
日期:2012.7.26
We report here the design, preparation, and systematic evaluation of a novel cycloalkane[d]isoxazole pharmacophoric fragment-containing androgen receptor (AR) modulators. Cycloalkane[d]isoxazoles form new core structures that interact with the hydrophobic region of the AR ligand-binding domain. To systematize and rationalize the RI structure activity relationship of the new fragment, we used molecular modeling to design a molecular library containing over 40 cycloalkane[d]isoxazole derivatives. The most potent compound, 4-(3a,4,5,6,7,7a-hexahydrobenzo[d]isoxazol-3-yl)2-(trifluoromethyl)benzonitrile (6a), exhibits antiandrogenic activity significantly greater than that of the most widely used antiandrogenic prostate cancer drugs bicalutamide (1) and hydroxyflutamide (2) in reporter gene assays measuring the transcriptional activity of AR (decreasing approximately 90% of the total AR activity) and in competitive AR ligand-binding assays (showing over four times higher potency to inhibit radioligand binding in comparison to bicalutamide). Notably, 6a maintains its antiandrogenic activity with AR mutants W741L and T877A commonly observed and activated by bicalutamide and hydroxyflutamide, respectively, in prostate cancer patients.