Synthesis of sulfonamides via copper-catalyzed oxidative C–N bond cleavage of tertiary amines
作者:Jing Ji、Zhengyi Liu、Ping Liu、Peipei Sun
DOI:10.1039/c6ob01208f
日期:——
A copper-catalyzed coupling reaction of sulfonyl chlorides with tertiaryamines via the oxidative C–N bond cleavage of tertiaryamines was developed. Sulfonamides were synthesized using this strategy in moderate to good yields. The reaction was applicable to various tertiaryamines, as well as sulfonyl chlorides.
A catalyst‐free, charge‐transfer complex promoted coupling of sulfonyl chlorides with vicinal tertiary diamines to generate sulfonamides is presented. Mechanistic studies showed that these reactions are proceeded via charge transfer of vicinal tertiary diamines to sulfonyl chlorides, forming the unstable sulfonyl quaternary ammonium like complexes which induced the regiospecific intramolecular C−N
NaI-Catalyzed Oxidative Amination of Aromatic Sodium Sulfinates: Synergetic Effect of Ethylene Dibromide and Air as Oxidants
作者:Ying Fu、Quan-Zhou Li、Qin-Shan Xu、Helmut Hügel、Ming-Peng Li、Zhengyin Du
DOI:10.1002/ejoc.201801386
日期:2018.12.31
A novel NaI-catalyzed oxidative amination of sodium sulfinates, employing both ethylenedibromide (EDB) and air as the oxidants, is described. EDB was first demonstrated to be a promising mild organic oxidant that in air, converted NaI into molecular iodine to promote the cross-coupling reactions of aromatic sodium sulfinates with amines to produce arylsulfonamides. Mechanistic studies indicated that
描述了一种使用二溴化乙烯 (EDB) 和空气作为氧化剂的新型 NaI 催化亚磺酸钠氧化胺化。EDB 首次被证明是一种有前途的温和有机氧化剂,它在空气中将 NaI 转化为分子碘,以促进芳族亚磺酸钠与胺的交叉偶联反应,生成芳基磺酰胺。机理研究表明,反应过程中可能涉及自由基途径。
Transition-Metal-Free and Visible-Light-Mediated Desulfonylation and Dehalogenation Reactions: Hantzsch Ester Anion as Electron and Hydrogen Atom Donor
作者:Micaela D. Heredia、Walter D. Guerra、Silvia M. Barolo、Santiago J. Fornasier、Roberto A. Rossi、María E. Budén
DOI:10.1021/acs.joc.0c01523
日期:2020.11.6
at rt. Alternately, a visible light method has been used for deprotection of N-methyl-N-arylsulfonamides with Hantzsch ester (HE) anion serving as the visible-light-absorbing reagent and electron and hydrogen atom donor to promote the desulfonylation reaction. The HE anion can be easily prepared in situ by reaction of the corresponding HE with KOtBu in DMSO at rt. Both protocols were further explored
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。
<i>N</i>-ALKYLATION OF<i>N</i>-MONOSUBSTITUTED SULFONAMTOES IN IONIC LIQUIDS
作者:Yi Hu、Zhen-Chu Chen、Zhang-Goo Le、Qin-Guo Zheng
DOI:10.1080/00304940409458677
日期:2004.8
N-dimethylformamide,2.7." and xylene." This method involves harsh reaction conditions, long reaction times and low yields in organic solvents. This reaction also can be accomplished via phase-transfer catalysts process? but involves the use of organic solvents. Recently, the N-alkylation of N-monosubstituted sulfonamides via the Mitsunobu reaction has been reported? However, these conditions require the use
N-单取代磺酰胺的 N-烷基化是 Gabriel 型仲胺合成中的关键步骤,随后通过 SN 键的已知还原程序裂解磺酰胺。* 此外,磺胺类药物本身构成一类重要的药学化合物。* 然而,这种转化的可用途径有些有限。这种反应通常需要强碱,如 Na。N w 4 NaOR?KOH6等和甲醇等有机溶剂的使用?乙醇?N,N-二甲基甲酰胺,2.7." 和二甲苯。" 该方法涉及苛刻的反应条件、较长的反应时间和在有机溶剂中的低收率。这个反应也可以通过相转移催化剂过程来完成?但涉及使用有机溶剂。最近,有报道称 N-单取代磺酰胺通过光信反应进行 N-烷基化?然而,这些条件需要使用昂贵的试剂、惰性气体、有机溶剂,反应时间长,有时收率低。因此,使用简便有效的方法对 N-单取代磺酰胺进行 N-烷基化仍然是有机合成中的一个挑战。