Alkyne Hydrothiolation Catalyzed by a Dichlorobis(aminophosphine) Complex of Palladium: Selective Formation of cis-Configured Vinyl Thioethers
作者:Roman Gerber、Christian M. Frech
DOI:10.1002/chem.201200388
日期:2012.7.16
Cis all round: Dichlorobis[1‐(dicyclohexylphosphanyl)piperidine]palladium, [(P(NC5H10)(C6H11)2})2Pd(Cl)2], is a highly efficient alkynehydrothiolation catalyst and the first generally applicable system that selectively generates cis‐configured anti‐Markovnikov adducts in excellent yields within only a few minutes at 120 °C in the presence of only 0.05 mol % of the catalyst (see scheme).
全面顺产:二氯双[1-(二环己基膦酰基)哌啶]钯,[[P (NC 5 H 10)(C 6 H 11) 2 }) 2 Pd(Cl) 2 ]是一种高效的炔烃加氢硫基化催化剂,第一个普遍适用的系统,仅在0.05 mol%的催化剂存在下,在120°C的情况下,仅需几分钟即可选择性地以优异的收率生成顺式构型的反马氏复合物(见方案)。
Base-Promoted Reactions of Organostibines with Alkynes and Organic Halides to Give Chalcogenated (<i>Z</i>)-Olefins and Ethers
Herein, with air-stable chalcogenated stibines (Sb–ER) as organometallic chalcogenating reagents, we developed base-promoted (Z)-hydrochalcogenation of alkynes with DMSO/DMSO-d6 as hydrogen/deuterium sources, giving chalcogenated (Z)-olefins in good yields and with excellent regioselectivity. These reagents, easily synthesized from halostibines with in situ generated [Zn(ER)2] at room temperature within
在此,我们以空气稳定的硫属代锑 ( Sb –ER) 作为有机金属硫属化合物试剂,开发了以 DMSO/DMSO- d 6作为氢/氘源的碱促进 ( Z )-炔烃的氢化反应,得到硫属代 ( Z )-烯烃产率高,区域选择性好。这些试剂很容易在室温下几分钟内由卤代锡与原位生成的 [Zn(ER) 2 ] 合成,也可用于碱促进的 C( sp 3 )-S(Se) 与 C 的交叉偶联( sp 3 )–X 和铜催化的 C( sp 2 )–S(Se) 与 C(sp 2 )–X (X = F, CI, Br, I) 在温和条件下。该协议也可以简单地扩展到具有良好功能耐受性的有机铋复合物 ( Bi -ER)。
Metal-free organocatalytic S-formylation of thiols using CO2
作者:Subir Maji、Arpan Das、Madhur Mahesh Bhatt、Swadhin K. Mandal
DOI:10.1038/s41929-024-01114-7
日期:——
anti-inflammatory medication molecules, as well as preparation of 13C-labelled formyl coenzyme A. Furthermore, we establish a one-pot S-formylation-olefination process for the synthesis of vinylsulfides under completely metal-free conditions in the presence of CO2. Overall, this study provides a platform to transform thiols and CO2 into value-added products.
硫醇的S-甲酰化是通过甲酸脱氢酶催化的酶促过程实现的,该酶将CO 2固定在底物上,这在调节活生物体的重要生物途径中起着至关重要的作用。通过化学方法实现这种反应性也可能是有利的,这将允许将CO 2固定在多种硫醇上。在这里,我们演示了在无金属条件下使用介离子N-杂环烯烃从CO 2制备S-甲酰硫醇的化学过程。该催化反应用于多样化从天然萜类化合物、脂肪醇、抗氧化剂和市售镇痛抗炎药物分子中获得的多种生物活性硫醇,以及13 C 标记的甲酰辅酶 A 的制备。此外,我们建立了在CO 2存在下完全无金属条件下合成乙烯基硫醚的一锅S-甲酰化-烯化工艺。总的来说,这项研究提供了一个将硫醇和CO 2转化为增值产品的平台。
A new method for the synthesis of anti-Markovnikov Z- or E-vinyl thioethers from thiosilane and terminal alkynes under visible-light-induced photoredox/nickel dual catalysis conditions is described. With a judicious choice of a simple nickel catalyst and a ligand, this strategy enables efficient and divergent access to both Z- or E-vinyl thioethers from the same set of simple starting materials. Notably