Catalyst-free direct C(sp<sup>3</sup>)–H sulfenylation of xanthene derivatives using air as the oxidant
作者:Qian Chen、Guodian Yu、Xiaofeng Wang、Yingcong Ou、Yanping Huo
DOI:10.1039/c8gc03898h
日期:——
A catalyst-free direct C(sp3)–H sulfenylation has been achieved via the autoxidative cross-dehydrogenative coupling (CDC) between xanthene derivatives and thiophenols in ethanol using air as the sole oxidant at room temperature. This simple and efficient method provides straightforward access to 9-sulfenylated xanthenes, 9,10-dihydroacridines and thioxanthene with good functional group compatibility
Double Cu‐Catalyzed Direct Csp<sup>3</sup>−H Azidation/CuAAC Reaction: A Direct Approach towards Demanding Triazole Conjugates
作者:Tobias Brandhofer、Aysegül Özdemir、Andrea Gini、Olga García Mancheño
DOI:10.1002/chem.201806288
日期:2019.3.15
The first one‐pot procedure for the double copper(I)‐catalyzed oxidative Csp3−H azidation–CuAAC process, implying unstable azide intermediates and easy‐to‐remove reagents under water‐tolerant conditions, is presented. The combination of tert‐butyl hydroperoxide as oxidant and TMSN3 as azide source for the C−H bond azidation, which produces harmless side‐products such as tBuOH and H2O, probed to be
Visible-Light-Induced Aerobic Oxidation of Benzylic C(sp3)–H of Alkylarenes Promoted by DDQ, tert-Butyl Nitrite, and Acetic Acid
作者:Zhenlu Shen、Decheng Pan、Yiqing Wang、Meichao Li、Xinquan Hu、Nan Sun、Liqun Jin、Baoxiang Hu
DOI:10.1055/s-0037-1610678
日期:2019.1
photocatalytic aerobic oxidation of benzylic C(sp3)–H bonds proceeded in the presence of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone, tert-butyl nitrite, and acetic acid. Advantages of this aerobic oxidation method include its relatively mild conditions, the use of visible-light irradiation instead of conventional thermal methods, the use of a low catalyst loading, and the ability to oxidize a range of alkylarenes
Electrochemically Mediated Direct C(
<i>sp</i>
<sup>3</sup>
)−H Sulfonylation of Xanthene Derivatives
作者:Wan‐Jie Wei、Yu‐Jing Zhong、Yu‐Feng Feng、Lei Gao、Hai‐Tao Tang、Ying‐Ming Pan、Xian‐Li Ma、Zu‐Yu Mo
DOI:10.1002/adsc.202101289
日期:2022.2.15
The construction of C(sp3)-sulfonyl bonds through directsulfonylation of C(sp3)−H bond presents a number of challenges, so an electrochemical oxidation-induced directsulfonylation of the xantheneC(sp3)−H bond was developed. Significant advantages of this method are high atom efficiency, functional group tolerance, transition metal- and oxidant-free conditions. The in vitro cytotoxicity of all product