A Pd/C-catalyzed deoxygenationmethod of phenolic hydroxyl groups via aryl triflates or mesylates using Mg metal in MeOH at room temperature was developed. The addition of NH4OAc dramatically affects the reactivity and reaction rate. This method is particularly attractive to provide an environmentally benign and widely applicable removal method of phenolic alcohols under quite mild reaction conditions
Cross‐Electrophile Coupling between Aryl/Vinyl Triflates and Vinyl Tosylates for the Synthesis of
<i>gem</i>
‐Difluoroalkenes via Ni/Pd Cooperative Catalysis
作者:Baojian Xiong、Yue Li、Jinyu Zhang、Jiangjun Liu、Xuemei Zhang、Zhong Lian
DOI:10.1002/adsc.202101388
日期:2022.3
A dual nickel-/palladium-catalyzed direct gem-difluorovinylation of readily available aryl/vinyltriflates with substituted gem-difluorovinyl tosylates is presented. This protocol affords various diaryldifluoroalkene, arylalkyldifluoroalkene and 1,1-difluoro-2-substituted-1,3-dienes under mild reaction conditions with excellent functional group compatibility, and provides a potential pathway to the
Dual Nickel-/Palladium-Catalyzed Reductive Cross-Coupling Reactions between Two Phenol Derivatives
作者:Baojian Xiong、Yue Li、Yin Wei、Søren Kramer、Zhong Lian
DOI:10.1021/acs.orglett.0c02165
日期:2020.8.21
Cross-coupling between substrates that can be easily derived from phenols is highly attractive due to the abundance of phenols. Here, we report a dual nickel-/palladium-catalyzed reductive cross-coupling between aryl tosylates and aryltriflates; both substrates can be accessed in just one step from readily available phenols. The reaction has a broad functional group tolerance and substrate scope (>60
Photoinduced phosphonation of aryl triflates with trialkyl phosphites via a tandem single-electron-transfer, C–O bond cleavage and Arbuzov rearrangement process in the absence of transition-metal and external photosensitizer is reported herein. The protocol features good functional group compatibility and mild reaction conditions, providing various aryl phosphates in good to high yields. Furthermore
Carbonylative Cross-Electrophile Coupling between Aryl Bromides and Aryl Triflates Enabled by Palladium and Rhodium Cooperative Catalysis and CO as Reductant
作者:Gang Chen、Ruoxin Zhou、Xuemei Zhang、Xue Xiao、Søren Kramer、Gui-Juan Cheng、Zhong Lian
DOI:10.1021/acscatal.2c04211
日期:2022.12.2
the most useful functional groups in organic synthesis. Here, we report a carbonylative cross-electrophile coupling reaction that utilizes carbonmonoxide gas as both carbonyl source and reductant. The use of Pd/Rh cooperative catalysis enables the carbonylative coupling of easily accessible aryl triflates and aryl bromides. Unlike previous carbonylative cross-electrophile coupling reactions, the method
酮是有机合成中最有用的官能团之一。在这里,我们报告了一种羰基化交叉亲电偶联反应,该反应利用一氧化碳气体作为羰基源和还原剂。Pd/Rh 协同催化的使用使易于获得的芳基三氟甲磺酸酯和芳基溴化物发生羰基偶联。与以前的羰基化交叉亲电偶联反应不同,该方法不需要添加化学计量的金属还原剂。值得注意的是,密度泛函理论 (DFT) 计算和同位素标记表明 CO 作为还原剂。