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。
作者:Faye Buckingham、Samuel Calderwood、Begoña Checa、Thomas Keller、Matthew Tredwell、Thomas Lee Collier、Ian M. Newington、Rajiv Bhalla、Matthias Glaser、Véronique Gouverneur
DOI:10.1016/j.jfluchem.2015.07.030
日期:2015.12
We report a late stage oxidative nucleophilicfluorination of N-arylsulfonamides, a class of compounds so far not considered as precursors to 4-fluorophenyl sulfonamides. By installing a para-positioned tert-butyl substituent on the aniline, oxidative fluorination takes place regioselectively in the presence of HF·pyridine and PIDA. This methodology has been shown to give good yields for a variety
Sulfonamide formation from sodium sulfinates and amines or ammonia under metal-free conditions at ambient temperature
作者:Kai Yang、Miaolin Ke、Yuanguang Lin、Qiuling Song
DOI:10.1039/c4gc02236j
日期:——
A novel, practical and highly efficient method for the construction of a variety of sulfonamides mediated by I2 was demonstrated. The reaction proceeds readily at roomtemperature using a variety of sodium sulfinates and amines or ammonia in water in a metal-, base-, ligand-, or additive-free protocol. Primary, secondary and tertiary sulfonamides were obtained in good to excellent yields with a broad
Sulfonamidation of Aryl and Heteroaryl Halides through Photosensitized Nickel Catalysis
作者:Taehoon Kim、Stefan J. McCarver、Chulbom Lee、David W. C. MacMillan
DOI:10.1002/anie.201800699
日期:2018.3.19
highly efficient method for nickel‐catalyzed C−N bond formation between sulfonamides and aryl electrophiles. This technology provides generic access to a broad range of N‐aryl and N‐heteroaryl sulfonamide motifs, which are widely represented in drug discovery. Initial mechanistic studies suggest an energy‐transfer mechanism wherein C−N bond reductive elimination occurs from a triplet excited NiII complex
Transition-metal-free mono- or dinitration of protected anilines
作者:Enrui Dai、Yongrui Dong、Rui Kong、Guangzhang Liu、Ying Dong、Qiong Wu、Deqiang Liang、Yinhai Ma
DOI:10.1080/00397911.2020.1752730
日期:2020.6.2
Abstract An amide-assisted arene nitration is presented, and both mono- and dinitration of protected anilines could be effected by using NaNO2 and NaNO3 as the mono- and bisnitrating agents, respectively. This divergent synthesis is transition-metal- and acid-free, and features a broad substrate scope, low cost, and ortho–para selectivity. Graphical Abstract
Soft–Hard Acid/Base-Controlled, Oxidative, <i>N</i>-Selective Arylation of Sulfonanilides via a Nitrenium Ion
作者:Saikat Maiti、Prasenjit Mal
DOI:10.1021/acs.joc.7b02841
日期:2018.2.2
functionalization of C–N bonds. Herein, an unprecedented N-selective arylation of sulfonanilides using soft–hard acid–base (SHAB) control by a nitreniumion over a carbenium ion is reported. Treatment of sulfonanilides with iodine(III) led to the formation of nitreniumions (soft), which preferentially react with biphenyls (soft) over bimesityl (hard) to generate C–N bonds. The iodine(III) was generated in