Efficient and Regioselective Synthesis of Phenothiazine via Ferric Citrate Catalyzed C-S/C-N Cross-Coupling
作者:Tonmoy Chitta Das、Syed Aziz Imam Quadri、Mazahar Farooqui
DOI:10.2174/1570178615666180806114523
日期:2018.12.4
Efficient C-S and C-N cross-coupling reactions have been developed for regioselective, scalable and environmentally benign synthesis of substituted phenothiazine derivatives. Cross-coupling reactions were demonstrated on various challenging substrates using non-toxic, highly economical, readily available ferric citrate as a catalyst to get desired product with high regioselectivity. Atom economy is
Transition-metal-free synthesis of phenothiazines from S-2-acetamidophenyl ethanethioate and <i>ortho</i>-dihaloarenes
作者:Yue Zhou、Qingle Zeng、Li Zhang
DOI:10.1080/00397911.2017.1281959
日期:2017.4.3
ABSTRACT An efficient cesium carbonate-mediated synthesis of phenothiazine derivatives from S-2-acetamidophenyl ethanethioates and ortho-dihaloarenes has been developed. This protocol affords an efficient approach for the construction of phenothiazine derivatives without the need of transition-metal catalyst or ligand. A plausible mechanism is proposed. GRAPHICAL ABSTRACT
Visible-Light-Promoted Direct Amination of Phenols via Oxidative Cross-Dehydrogenative Coupling Reaction
作者:Yating Zhao、Binbin Huang、Chao Yang、Wujiong Xia
DOI:10.1021/acs.orglett.6b01371
日期:2016.7.15
between phenols and cyclic anilines via cross-dehydrogenativecoupling (CDC) amination that was mediated by visible light, wherein K2S2O8 served as an external oxidant. The salient features of this protocol include circumventing the requirement for prefunctionalized starting materials and achieving single regioselectivity of amination adducts at roomtemperature.
公开了一种无过渡金属的方法,该方法通过可见光介导的交叉脱氢偶联(CDC)胺在酚和环状苯胺之间形成分子间芳基C–N键,其中K 2 S 2 O 8用作外部氧化剂。该方案的显着特征包括规避对预功能化原料的需求,并在室温下实现胺加合物的单一区域选择性。