A copper-catalyzed procedure for the direct synthesis of 1,4-dihydroxy-2-phenylsufonylbenzenes is presented starting from simple quinones and sulfonyl hydrazides. A series of biologically useful FabH inhibitors are obtained in good yields. Both aryl and alkyl substituents are well tolerated in the reaction.
One-pot access to sulfonylated naphthalenediols/hydroquinones from naphthols/phenols with sodium sulfinates in an aqueous medium
作者:Lingxin Meng、Ruike Zhang、Yuqiu Guan、Tian Chen、Zhiqiang Ding、Gongshu Wang、Aikebaier Reheman、Zhangpei Chen、Jianshe Hu
DOI:10.1039/d0nj05285j
日期:——
aqueous medium has been developed with up to 97% yield. The whole reaction requiring no transition-metal catalysts could proceed smoothly with hypervalent iodine compounds as the oxidant. Both naphthols and phenols were viable with inexpensive and readily available sodium sulfinates as the sulfonylation reagents under an ambient atmosphere. This procedure is scalable, and the products could be easily obtained
Ionic Liquids-Promoted Addition of Arylsulfinic Acids to <i>p</i>-Quinones: A Green Synthesis of Diaryl Sulfones
作者:J. Yadav、B. Reddy、T. Swamy、N. Ramireddy
DOI:10.1055/s-2004-829145
日期:——
Arylsulfinic acids undergo smooth conjugate addition to p-quinones in air- and moisture-stable second generation room temperature ionic liquid [bmim]BF 4 under mild conditions to produce the corresponding arylsulfonylhydroquinones in excellent yields with high selectivity. In this reaction, ionic liquid plays the dual role as the solvent and the catalyst. The quinones show enhanced reactivity in ionic
Reactions of the free toluene-p-sulphonyl radical. Part I. Diagnostic reactions of free radicals
作者:C. M. M. da Silva Corrêa、William A. Waters
DOI:10.1039/j39680001874
日期:——
The free p·CH3·C6H4·SO2 radical is easily produced by the thermolysis or photolysis of p·Me·C6H4·SO2·l; copper powder assists the removal of iodine and so do radicals R2C(CN)·. Evidence is presented to show that p·Me·C6H4·SO2·l adds homolytically to olefins and that free p·Me·C6H4·SO2· radicals tend to disproportionate according to the equation: 6 Me·C6H4·SO2·→ 2(Me·C6H4·SO2)2O + Me·C6H4·S·SO2·C6H4·Me
p ·Me·C 6 H 4 ·SO 2 ·l的热解或光解容易产生游离的p ·CH 3 ·C 6 H 4 ·SO 2自由基;铜粉有助于去除碘,自由基R 2 C(CN)·也是如此。证据表明,p ·Me·C 6 H 4 ·SO 2 ·l向烯烃均溶,并且游离的p ·Me·C 6 H 4 ·SO 2 ·自由基根据以下方程式趋于歧化:6 Me· C 6H 4 ·SO 2 · → 2(Me·C 6 H 4 ·SO 2)2 O + Me·C 6 H 4 ·S·SO 2 ·C 6 H 4 ·Me p ·Me·C 6 H 4 ·SO 2 ·自由基添加醌给予ditoluene-的氧原子p quinols的-磺酸盐酯。芳基亚磺酰基基团似乎不具有类似的反应性。它们仅二聚为硫代磺酸酯Ar·S·SO 2 ·Ar。