据报道,借助8-氨基喹啉基辅助基团,钴可有效催化芳烃和烯烃的酰氧基化反应。在该转化中,苯甲酸,烯基酸和脂族酸可以容易地参与以提供结构上多样化的酯。值得注意的是,硫酸银(Ag 2 SO 4)氧化剂是可再生的,并且可以除去和回收导向基团。该策略代表了过渡金属催化的烯基羧酰胺C(sp 2)-H键与羧酸的酰氧基化的第一个成功实例。
Ligand-Enabled, Copper-Promoted Regio- and Chemoselective Hydroxylation of Arenes, Aryl Halides, and Aryl Methyl Ethers
作者:Bijaya Kumar Singh、Ranjan Jana
DOI:10.1021/acs.joc.5b02302
日期:2016.2.5
chemoselective hydroxylation. Interestingly, typical regiochemical scrambling associated with the C–H activation was further resolved by introducing a ligand-directed ortho hydroxylation of haloarenes and aryl methyl ethers.
An efficient protocol for the cobalt‐catalyzed acyloxylation of arenes and alkenes with the assistance of an 8‐aminoquinolyl auxiliary group is reported. In this transformation, benzoic acids, alkenyl acids, and aliphatic acids could be readily involved to afford structurally diverse esters. It is worth noting that the silver sulfate (Ag2SO4) oxidant is renewable and the directing group could be removed
据报道,借助8-氨基喹啉基辅助基团,钴可有效催化芳烃和烯烃的酰氧基化反应。在该转化中,苯甲酸,烯基酸和脂族酸可以容易地参与以提供结构上多样化的酯。值得注意的是,硫酸银(Ag 2 SO 4)氧化剂是可再生的,并且可以除去和回收导向基团。该策略代表了过渡金属催化的烯基羧酰胺C(sp 2)-H键与羧酸的酰氧基化的第一个成功实例。
Cobalt-Catalyzed Directed<i>sp</i><sup>2</sup>C−H Acetoxylation of Arenes Employing Mn(OAc)<sub>3</sub> ⋅ 2H<sub>2</sub>O as Acetoxy Source
作者:Writhabrata Sarkar、Arup Bhowmik、Aniket Mishra、Tripta Kumari Vats、Indubhusan Deb
DOI:10.1002/adsc.201800398
日期:2018.9.3
A cobalt‐catalyzed sp2 C−H acetoxylation of amides having 8‐aminoquinoline as a directing group has been achieved using manganese(III) acetate both as an oxidant and an acetoxysource. Operational simplicity, broad range of functional group tolerance, use of an earth abundant first row transition metal, and, most importantly, exploitation of an unprecedented acetoxysource are the key features. The