Lewis Acid Coordination Redirects S‐Nitrosothiol Signaling Output
作者:Valiallah Hosseininasab、Alison C. McQuilken、Abolghasem (Gus) Bakhoda、Jeffery A. Bertke、Qadir K. Timerghazin、Timothy H. Warren
DOI:10.1002/anie.202001450
日期:2020.6.26
reservoirs for nitric oxide in biology. While copper enzymes promote NO release from RSNOs by serving as Lewisacids for intramolecular electron‐transfer, redox‐innocent Lewisacids separate these two functions to reveal the effect of coordination on structure and reactivity. The synthetic Lewisacid B(C6F5)3 coordinates to the RSNO oxygen atom, leading to profound changes in the RSNO electronic structure
S-亚硝基硫醇(RSNOs)在生物学中是一氧化氮的空气稳定储库。铜酶通过充当分子内电子转移的路易斯酸来促进RSNO的NO释放,而无氧化还原的路易斯酸将这两个功能分开,以揭示配位对结构和反应性的影响。合成的路易斯酸B(C 6 F 5)3与RSNO氧原子配位,导致RSNO电子结构和反应性发生深刻变化。尽管RSNO具有相对负的还原电位,但B(C 6 F 5)3与NHE相比,配位将其还原电位提高了1 V以上,达到了生理上可利用的+0.1V。外球化学还原给出路易斯酸稳定化的二价阴离子hyponitrite反式- [LA-O-N = N-O-LA] -2- [LA = B(C 6 ˚F 5)3 ],其释放Ñ 2在酸化时O操作。机理和计算研究支持[RSNO-B(C 6 F 5)3 ]自由基阴离子的初步还原,该自由基阴离子在失去RSSR之前易受N-N耦合的影响。
ABSTRACT An efficient and practical oxidativecoupling of thiols to symmetrical disulfides is developed at room temperature under aerobic conditions. The commercially available sodium methoxide solution 30 wt. % in methanol together with the air was used as a retrievable promoter system and green oxidant, respectively, for the preparation of symmetrical disulfides. The desired products were obtained
Reactions of Cage Substrates with Sulfur Nucleophiles
作者:Yu. N. Klimochkin、E. A. Ivleva、V. A. Shiryaev
DOI:10.1134/s1070428021030052
日期:2021.3
Abstract Reactions of alcohols of the adamantane series and adamantan-1-yl nitrates with sulfur nucleophiles in 94% sulfuric acid afforded a number of new sulfur-containing adamantane derivatives such as carbamothioates, isothiocyanates, and carbamodithioates. Di(adamantan-1-yl) disulfide was synthesized by reaction of admantan-1-yl nitrate with sodium sulfide nonahydrate in 94% sulfuric acid.
Mechanochemical Electrophilic Mono- or Disulfur Transfer: Construction of P(O)–S or P(O)–S–S Bonds
作者:Ziwu Zhang、Tianfeng Lao、Lichan Deng、Chen Zhang、Jubin Liu、Min Fu、Zhengquan Su、Yue Yu、Hua Cao
DOI:10.1021/acs.orglett.2c03018
日期:2022.10.7
mechanochemically induced conditions, a wide range of diarylphosphine oxides or H-phosphonates react with trisulfide dioxides to afford various thiophosphate derivatives in good yields. Selective S–S bond cleavage of trisulfide dioxides determined by connecting groups is proposed as the key step in the construction of P(O)–S or P(O)–S–S bonds, which is supported by calculations.