Copper-Catalyzed Transformation of Hydrazones into Halogenated Azabutadienes, Versatile Building Blocks for Organic Synthesis
作者:Valentine G. Nenajdenko、Alexey V. Shastin、Vladimir M. Gorbachev、Sergey V. Shorunov、Vasiliy M. Muzalevskiy、Anna I. Lukianova、Pavel V. Dorovatovskii、Victor N. Khrustalev
DOI:10.1021/acscatal.6b03196
日期:2017.1.6
A one-step copper-catalyzed reaction of aldehyde-derived N-substituted hydrazones with CCl4 resulted in efficient synthesis of 4,4-dichloro-1,2-diazabuta-1,3-dienes. It was proven that this C–C bond-forming cascade reaction operates via an addition of trichloromethyl radical to the C═N bond of hydrazone followed by a base-induced elimination of HCl. The reaction was found to be very general, as diverse
醛衍生的N-取代的azo与CCl 4的一步铜催化反应可有效合成4,4-二氯-1,2-二氮杂丁-1,3-二烯。事实证明,这种C–C键形成级联反应是通过在的C═N键中添加三氯甲基自由基,然后通过碱诱导的HCl去除而实现的。发现该反应非常笼统,因为在N位具有各种芳族基团以及C位具有芳族,脂族和杂环取代基的各种azo是能够与多种多卤代化合物(CCl 3 Br,CBr 4,CCl 3 CN,CCl 3 COOEt,CCl 3 CF 3,CBr3 CF 3)来生产一族功能化的1,2-二氮杂丁-1,3-二烯。已证明,所制备的杂二烯是用于各种有价值的无环和杂环分子的直接组装的高度通用的构建基。