已开发出在室温(rt)和无过渡金属条件下进行N-和O-磺酰化的新方法。第一种方法涉及在室温下仅使用二甲基亚砜(DMSO)中的KO t Bu将各种N-磺酰基杂环和苯基苯磺酸盐以良好或优异的收率转化为相应的脱磺酰化产物。或者,已经使用可见光方法用作为可见光吸收剂的Hantzsch酯(HE)阴离子和电子和氢原子供体来促进N-甲基-N-芳基磺酰胺的脱保护,以促进脱磺酰化反应。HE阴离子可轻松就地制备通过在室温下将相应的HE与DMSO中的KO t Bu反应。进一步研究了两种方案的合成范围和机制方面,以合理化脱磺酰化工艺的关键特征。此外,HE阴离子在可见光照射下诱导芳基卤化物的还原脱卤反应。
Nickel‐Catalyzed Cross‐Coupling of Sulfonamides With (Hetero)aryl Chlorides
作者:Ryan T. McGuire、Connor M. Simon、Arun A. Yadav、Michael J. Ferguson、Mark Stradiotto
DOI:10.1002/anie.202002392
日期:2020.6.2
The development of Ni-catalyzed C-N cross-couplings of sulfonamides with (hetero)arylchlorides is reported. These transformations, which were previously achievable only with Pd catalysis, are enabled by use of air-stable (L)NiCl(o-tol) pre-catalysts (L=PhPAd-DalPhos and PAd2-DalPhos), without photocatalysis. The collective scope of (pseudo)halide electrophiles (X=Cl, Br, I, OTs, and OC(O)NEt2 ) demonstrated
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。