Synthesis of Isoxazolines and Isoxazoles via Metal-Free Desulfitative Cyclization
作者:Qiu Sun、Ling He、Jiaxin Cheng、Ze Yang、Yuansheng Li、Yulan Xi
DOI:10.1055/s-0037-1609480
日期:2018.6
bonds/construction of C–O bonds/elimination of SO2/C–N bond formation is achieved in sequence in the reaction system. A novel, one-pot reaction for the synthesis of isoxazolines and isoxazoles is developed via a cascade process under metal-free conditions. The approach involves the formation of intramolecular C–N and C–O bonds and intermolecular C–C bonds from aromatic alkenes or alkynes and N-hydroxysulfonamides
Facile consecutive three-component synthesis of 3,5-disubstituted isoxazoles
作者:Christina Görgen、Thomas J. J. Müller
DOI:10.1007/s10593-017-2069-x
日期:2017.4
3,5-Di(hetero)aryl-substituted isoxazoles can be rapidly synthesized in a one-pot fashion by a consecutive three-component alkynylation–cyclization sequence starting from (hetero)aroyl chloride, alkynes, and sodium azide/acetic acid under copper-free palladium catalysis as exemplified by 9 different products.
The palladiumcatalyzed one-pot synthesis of isoxazoles and pyrazoles from aryl iodides, terminal alkynes, chromium hexacarbonyl and hydroxylamine hydrochloride or aqueous hydrazine solution is described. The Sonogashira carbonylative coupling intermediate was trapped in situ by hydroxylamine hydrochloride or aqueous hydrazine to deliver isoxazoles or pyrazoles, respectively, in high yields. This efficient
Three heterocycles from one starting material: A divergent method for the synthesis of isoxazolines, isoxazoles, and 5-hydroxy-2-isoxazolines from oximes is developed using TEMPO as a radical initiator. Oxidants control the selectivity of the product formations.
来自一种原料的三个杂环:使用 TEMPO 作为自由基引发剂开发了一种从肟合成异恶唑啉、异恶唑和 5-羟基-2-异恶唑啉的不同方法。氧化剂控制产物形成的选择性。
4-dimethoxyphenyl)-5-(thiophen-2-yl)isoxazole 14, we designed a set of 4-(trifluoromethyl)isoxazoles for synthesis and further anti-cancer evaluation. Among various molecules, 3-(3,4-dimethoxyphenyl)-5-(thiophen-2-yl)-4-(trifluoromethyl)isoxazole 2g (IC50 = 2.63 μM) and 3-(thiophen-2-yl)-5-(4-(thiophen-2-yl)-1H-pyrrol-3-yl)-4-(trifluoromethyl)isoxazole 5 (IC50 = 3.09 μM) exhibited the best anti-cancer activity
在此,我们报告了一系列完全取代的 4-(三氟甲基)异恶唑的设计和合成,并评估了它们对 MCF-7、4T1 和 PC-3 细胞系的抗癌活性,作为概念验证研究。 4-(三氟甲基)异恶唑是一类合成上具有挑战性的分子,迄今为止开发出的合成方法很少,并且所有方法都受到一些严重的限制。最近,我们开发了一种新颖的、无金属的通用合成策略,以使用廉价的 CF 3 SO 2 Na 作为 –CF 3基团的来源和多任务t BuONO 作为原料,从容易获得的查尔酮开始获得具有合成挑战性的 4-(三氟甲基)异恶唑。氧化剂以及N和O的来源,因此我们克服了以前方法的局限性。基于异恶唑类抗癌剂 3-(3,4-二甲氧基苯基)-5-(噻吩-2-基)异恶唑14的结构,我们设计了一组用于合成和合成的 4-(三氟甲基)异恶唑。进一步的抗癌评价。在各种分子中,3-(3,4-二甲氧基苯基)-5-(噻吩-2-基)-4-(三氟甲基)异恶唑2g