Highly chemo- and regioselective C–P cross-coupling reaction of quinone imine ketals with Ar<sub>2</sub>P(O)H to construct <i>ortho</i>-amino triarylphosphine derivatives
作者:Teng Liu、Yongqin Li、Feixiang Cheng、Xianfu Shen、Jianjun Liu、Jun Lin
DOI:10.1039/c9gc00989b
日期:——
A highly chemo- and regioselective approach for the construction of ortho-amino triarylphosphine oxides has been achieved through a C–P cross-coupling reaction involving quinoneimineketals (QIKs) with Ar2P(O)H and catalyzed via a Lewis base. This alternative protocol provided a wide substrate scope with excellent yields (82–95%), and a variety of ortho-amino triarylphosphines were obtained with high
Cu‐Catalyzed Coupling Reactions of Sulfonamides with (Hetero)Aryl Chlorides/Bromides
作者:Qiaoli Li、Lanting Xu、Dawei Ma
DOI:10.1002/anie.202210483
日期:2022.10.24
of (hetero)aryl halides proceeds with excellent reaction scope by using oxalamides or 4-hydroxypicolinamides as the ligands. For bromides, only 2–5 mol % CuI and oxalamides were required. For chlorides, increasing catalytic loadings to 10 mol % Cu2O and ligands was needed. Direct sulfonamidation of four chloro-containing marketed drugs and preparation of two sulfonamide drugs were achieved under these
通过使用草酰胺或 4-羟基吡啶甲酰胺作为配体,Cu 催化的(杂)芳基卤化物磺酰胺化反应具有出色的反应范围。对于溴化物,仅需要 2–5 mol% CuI 和草酰胺。对于氯化物,需要将催化负载增加到 10 mol% Cu 2 O 和配体。在此条件下实现了四种含氯市售药物的直接磺酰胺化和两种磺胺类药物的制备。
Electrochemical [3+2] Cycloaddition of Anilines and 1,3‐Dicarbonyl Compounds: Construction of Multisubstituted Indoles
作者:Xiaoqiang Chang、Xingyu Chen、Sixian Lu、Yifan Zhao、Yue Ma、Dong Zhang、Lan Yang、Peng Sun
DOI:10.1002/adsc.202200488
日期:2022.8.16
Indoles, especially multisubstituted ones, are privileged scaffolds found widely in natural products, bioactive molecules, fine chemicals, and organic functional materials. Although several intramolecular electrochemical cyclization reactions of vinyl anilines to construct indoles have been reported in recent years, the intermolecular process between simple anilines and other readily available synthons
arylalkylation of activated alkenes via hydrogen-atomtransfer and aryl migration strategy. The reaction was carried out through a radical-mediated continuous migration pathway using N-fluorosulfonamides as the alkyl source. The primary, secondary, and tertiary alkyl radicals formed by intramolecular hydrogen-atomtransfer proceeded smoothly. This methodology is an efficient approach for the synthesis of various
A new method for selective cleavage of sulfonimides into sulfonamides in high yields using a simple electrochemical approach is shown. As revealed by the electrochemical study, the aromatic sulfonimides can be selectively cleaved by electrolysis of the starting compound at a given potential (only −0.9 V vs SCE for the nosyl group). The high chemoselectivity was confirmed by preparative electrolysis
展示了一种使用简单的电化学方法以高产率将磺酰亚胺选择性裂解为磺酰胺的新方法。电化学研究表明,芳香族磺酰亚胺可以通过在给定电位下电解起始化合物来选择性裂解(对硝基苯磺酰基团而言,相对于 SCE 仅-0.9 V)。高化学选择性通过制备电解得到证实,并且结果得到一组具有不同磺酰亚胺功能的物质的DFT计算的支持。此外,还测试了各种实验设置以及其他简化程序的尝试。最后,无论对硝基苯磺酰基团的数量和复杂分子的整体形状如何,从相应的磺酰亚胺中去除对硝基苯磺酰基团都会顺利进行。因此,该方法对于用于多功能分子(例如杯[ n ]芳烃)领域很有意义。