bisthiolation of terminal alkynes, K2S (potassium sulfide) and diaryliodoniumsalts for the assembly of functionalized (Z)‐1,2‐bis(arylthio)alkene derivatives has been accomplished for the first time. This unique observation features a broad substrate scope, excellent functional‐group tolerance, and high regioselectivity. Especially, an arylthiolate anion from diaryliodoniumsalts and potassium sulfide
Palladium-catalyzed bisthiolation of terminal alkynes for the assembly of diverse (<i>Z</i>)-1,2-bis(arylthio)alkene derivatives
作者:Yin-Long Lai、Shaoxi Yan、Dan He、Li-Zhen Zhou、Zi-Shen Chen、Yu-Long Du、Jianxiao Li
DOI:10.1039/d1ra05773a
日期:——
An efficient and straightforward palladium-catalyzed three-component cascade bisthiolation of terminalalkynes and arylhydrazines with sodium thiosulfate (Na2S2O3) as the sulfur source for the assembly of functionalized (Z)-1,2-bis(arylthio)alkene derivatives is described. Using 0.5 mol% IPr–Pd–Im–Cl2 as the catalyst, a wide range of terminalalkynes and arylhydrazines are well tolerated, thus producing
以硫代硫酸钠 (Na 2 S 2 O 3 ) 作为硫源组装官能化 ( Z )-1,2-双(芳硫基)烯烃的高效且直接的钯催化三组分级联双硫醇末端炔烃和芳基肼衍生品进行了描述。使用 0.5 mol% IPr–Pd–Im–Cl 2作为催化剂,可以很好地耐受多种末端炔烃和芳基肼,从而以良好的收率生产所需的产物,具有良好的官能团耐受性和优异的区域选择性。此外,该协议可以很容易地扩大规模,显示出在有机合成和材料科学中的潜在应用。
Unconventional Reactivity of Ethynylbenziodoxolone Reagents and Thiols: Scope and Mechanism
作者:Bin Liu、Juan V. Alegre‐Requena、Robert S. Paton、Garret M. Miyake
DOI:10.1002/chem.201904520
日期:2020.2.21
high temperatures, and disulfides (R2 S2 ). Herein, a general and efficient strategy utilizing ethynylbenziodoxolone (EBX) reagents and thiols is presented that results in the formation of 1,2-dithio-1-alkenes with excellent regioselectivity and stereoselectivity through unprecedented reactivity between the EBX and the thiol. This operationally simple procedure utilizes mild conditions, which result in
Addition of diaryl disulfides to terminal alkynes catalysed by an MCM-41-supported bidentate phosphine palladium(0) complex
作者:Jianying Li、Jun Liu、Mingzhong Cai
DOI:10.3184/030823409x12526892025829
日期:2009.10
2-bis(arylthio)-substituted alkenes have been conveniently synthesised in high yields by the stereoselective addition of diaryl disulfides to terminal alkynes catalysed by an MCM-41-supported bidentate phosphinepalladium(0) complex. This polymeric palladium catalyst can be recovered and reused many times without any loss of activity.
We describe here an efficient route for the synthesis of (Z)-vinylic sulfides 3 via the highly regio- and stereoselective coupling of (Z)-1,2-bis(aryl(alkyl)thio)alkenes and Grignard reagents over a Ni catalyst under mild conditions. (Z)-Vinylic sulfides 3 are important intermediates in the synthesis of tri- and tetrasubstituted alkenes that are important construction blocks for drugs and natural products
我们在这里描述了通过Ni催化剂上的(Z)-1,2-双(芳基(烷基)硫代)烯烃和格氏试剂的高度区域选择性和立体选择性偶联来合成(Z)-乙烯基硫化物3的有效途径在温和的条件下。(Z)-Vinylic硫化物3是三和四取代烯烃合成的重要中间体,这是药物和天然产物的重要结构单元。可以使用H 2 O 2将定向有机硫基团(SR)转化为二芳基(烷基)二硫化物(RSSR)。作为氧化剂,避免了硫资源的浪费。该协议提供了一种高度区域选择性和立体选择性的通用方法,用于合成多种三取代和四取代的烯烃。