Copper-Catalyzed Cascade Syntheses of 2H-benzo[b][1,4]thiazin-3(4H)-ones and Quinoxalin-2(1H)-ones through Capturing S and N Atom Respectively from AcSH and TsNH2
摘要:
A copper-catalyzed cascade method has been developed to synthesize the 2H-benzo[b][1,4]thiazin-3(4H)-ones from 2-halo-N-(2-halophenyl)-acetamides 1 and AcSH via the S(N)2/deacetylation/coupling process, and to synthesize the quinoxalin-2(1H)-ones from 1 and TsNH2 via the S(N)2/coupling/desulfonation process. The target products were obtained with diversity at three positions on their scaffolds.
This study demonstrates the successful formation of a radicalanion intermediate in a moist atmosphere, facilitating chemical reactions by activating aerial dioxygen through a single electron transfer (SET) mechanism. Derived from deprotonating quinoxaline-2(1H)-one with KOtBu, it shows potential in oxygenation chemistry. Validation comes from radical scavenging and EPR experiments.
这项研究证明了在潮湿大气中成功形成自由基阴离子中间体,通过单电子转移(SET)机制激活空气中的分子氧来促进化学反应。由喹喔啉-2(1 H )-酮与 KO t Bu 去质子化而得,在氧化化学方面显示出潜力。验证来自激进清除和 EPR 实验。
A visible light mediated, metal and oxidant free highly efficient cross dehydrogenative coupling (CDC) reaction between quinoxalin-2(1<i>H</i>)-ones and ethers
作者:Kishor D. Mane、Rohit B. Kamble、Gurunath Suryavanshi
DOI:10.1039/c9nj00075e
日期:——
The efficient and metalfree, white light mediated 3C alkylation of quinoxalin-2(1H)-ones via a cross dehydrogenative couplingreaction with cyclic ethers using eosin Y as a photocatalyst is described. This reaction has broad substrate scope and strong functional group tolerance with good to excellent yields.
Copper-Catalyzed Cascade Syntheses of 2<i>H</i>-benzo[<i>b</i>][1,4]thiazin-3(4<i>H</i>)-ones and Quinoxalin-2(1<i>H</i>)-ones through Capturing S and N Atom Respectively from AcSH and TsNH<sub>2</sub>
作者:Dingben Chen、Zhi-Jing Wang、Weiliang Bao
DOI:10.1021/jo101253a
日期:2010.8.20
A copper-catalyzed cascade method has been developed to synthesize the 2H-benzo[b][1,4]thiazin-3(4H)-ones from 2-halo-N-(2-halophenyl)-acetamides 1 and AcSH via the S(N)2/deacetylation/coupling process, and to synthesize the quinoxalin-2(1H)-ones from 1 and TsNH2 via the S(N)2/coupling/desulfonation process. The target products were obtained with diversity at three positions on their scaffolds.