Selective trifluorination of alkyl aryl sulfides using IF5
摘要:
In the reaction of IF5 with alkyl aryl sulfides in heptane under reflux conditions, the arylthio group migrated once and three fluorine atoms were selectively introduced on the alkyl chain. In order to find the reason why the reaction stopped at the trifluorination step, we examined the oxidation potentials of the starting material, a reaction intermediate, and the product, and the time course of the reactions. (C) 2004 Elsevier Ltd. All rights reserved.
The First Example of .ALPHA.-Thiomagnesiums Generated from Dithioacetal Monoxides with Grignard Reagent; Their Properties and Some Synthetic Applications.
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Hydrodesulfurization Using Hydrosilanes – Metal-Free Reduction of Sulfides
作者:Kodai Saito、Kazumi Kondo、Takahiko Akiyama
DOI:10.1021/acs.orglett.5b01651
日期:2015.7.2
B(C6F5)3-catalyzed hydrodesulfurization of carbon–sulfur bonds was achieved using triethylsilane as the reducing agent. The corresponding products were obtained in good yields under mild reaction conditions. This protocol could be applied to the reduction of sulfides, including benzyl and alkyl sulfides and dithianes, with high chemoselectivities.
使用三乙基硅烷作为还原剂,实现了B(C 6 F 5)3催化的碳硫键加氢脱硫。在温和的反应条件下以高收率获得了相应的产物。该方案可用于具有高化学选择性的硫化物的还原,包括苄基和烷基硫化物以及二噻烷。
Nickel-Catalyzed Reductive Thiolation of Unactivated Alkyl Bromides and Arenesulfonyl Cyanides
作者:Fei Wang、Weidong Rao、Shun-Yi Wang
DOI:10.1021/acs.joc.1c00903
日期:2021.7.2
alkyl bromides with arenesulfonyl cyanides catalyzed by Ni(acac)2 under reductive conditions to form unsymmetrical sulfides is developed. This approach for sulfide synthesis is practical, relies on available, unfunctionalized materials such as alkyl (pseudo)halides, and is scalable. This catalytic strategy provides a complementary method for the preparation of unsymmetrical alkyl–aryl sulfides under
An Iodine-Mediated Hofmann-Löffler-Freytag Reaction of Sulfoximines Leading to Dihydroisothiazole Oxides
作者:Duo Zhang、Han Wang、Hanchao Cheng、José G. Hernández、Carsten Bolm
DOI:10.1002/adsc.201701178
日期:2017.12.19
A Hofmann‐Löffler‐Freytag type cyclization reaction of S‐aryl‐S‐phenylpropyl sulfoximines (and related derivatives) was developed. Using molecular iodine as the initiator under visible light a series of five‐membered cyclic products was obtained in moderate to high yields. The approach represents a new strategy for the synthesis of dihydroisothiazole oxides and benzo[d]isothiazoles‐1‐oxides.
的霍夫曼-洛夫勒-Freytag型环化反应小号-芳基-小号苯基丙基的亚磺酰亚胺(和相关的衍生物)的开发。使用分子碘作为引发剂,在可见光下可以中等至高收率获得一系列五元环状产物。该方法代表了合成二氢异噻唑氧化物和苯并[ d ]异噻唑-1-氧化物的新策略。
Aerial dioxygen activation <i>vs.</i> thiol–ene click reaction within a system
作者:Khokan Choudhuri、Arkalekha Mandal、Prasenjit Mal
DOI:10.1039/c8cc01359d
日期:——
Markovnikov or anti-Markovnikov selective thiol–ene click (TEC) reactions and the synthesis of β-hydroxysulfides via aerial dioxygen activation are prevalent C–S bond forming reactions of styrenes and thiophenols. Herein, by choosing appropriate environments using solvents with additives or neat conditions, any one of these three reactions was achieved exclusively in excellent yields.
cobaloxime to produce olefins and H2. This operationally simple method enables direct dehydrogenation of readily available chemical feedstocks to diversely functionalized olefins. For example, we demonstrate, for the first time, the oxidant-free desaturation of thioethers and amides to alkenyl sulfides and enamides, respectively. Moreover, the system’s exceptional siteselectivity and functional group
脂肪族催化脱氢 (CDA) 在有机合成中的价值在很大程度上仍未得到充分探索。已知的均相 CDA 系统通常需要使用牺牲氢受体(或氧化剂)、贵金属催化剂和苛刻的反应条件,因此将大多数现有方法限制为非或低官能化烷烃的脱氢。在这里,我们描述了一种可见光驱动的双催化剂系统,该系统由廉价的有机光氧化还原和贱金属催化剂组成,用于室温、无受体 CDA (Al-CDA)。该过程由光激发的 2-氯蒽醌引发,涉及脂肪族的 H 原子转移 (HAT) 形成烷基自由基,然后与钴肟反应生成烯烃和 H 2. 这种操作简单的方法能够将容易获得的化学原料直接脱氢成多种官能化的烯烃。例如,我们首次证明了硫醚和酰胺在无氧化剂条件下分别脱饱和为烯基硫醚和烯酰胺。此外,14 种生物相关分子和药物成分的后期脱氢和合成说明了该系统卓越的位点选择性和官能团耐受性。机理研究揭示了双重 HAT 过程,并提供了对反应性和位点选择性起源的见解。