Substrate Controlled Synthesis of Benzisoxazole and Benzisothiazole Derivatives via PhI(OAc)<sub>2</sub>-Mediated Oxidation Followed by Intramolecular Oxidative O–N/S–N Bond Formation
作者:Devireddy Anand、Om P. S. Patel、Rahul K. Maurya、Ruchir Kant、Prem P. Yadav
DOI:10.1021/acs.joc.5b02276
日期:2015.12.18
formation of (E)-(2-aminoaryl)(aryldiazenyl)methanone as the key intermediate, followed by intramolecular oxidative O–N/S–N bond formation in one pot at room temperature. The quiet different reactivity of the substrate is due to the formation of a diazo intermediate which encounters a nucleophilic attack by carbonyl oxygen on the electrophilic amine to produce isoxazole products, as compared to the previous
已开发出一种由二乙酸苯碘(III)(PIDA)介导的高效串联方法,该方法可从简单的2-氨基-N'-芳基苯并酰肼合成芳基二氮杂异恶唑(异噻唑)芳烃。反应通过形成(E)-(2-氨基芳基)(芳基二氮烯基)甲酮为关键中间体,然后在室温下在一锅中形成分子内氧化O-N / S-N键。所述衬底的所述安静不同反应性是由于中间重氮其遇到上亲电胺的亲核攻击羰基通过氧,以产生异恶唑产物的形成,相比于先前的reportsa,B,4,其中一个Ñ -acylnitrenium离子中间体分子内被胺基捕获。