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。
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。
Stereoselective Formation of<i>Z</i>- or<i>E</i>-Vinyl Thioethers from Arylthiols and Acetylenes under Transition-Metal-Free Conditions
作者:Yunfeng Liao、Shanping Chen、Pengcheng Jiang、Hongrui Qi、Guo-Jun Deng
DOI:10.1002/ejoc.201300727
日期:2013.10
Vinyl sulfide formation with good yield and high regio- and stereoselectivities from thiols and acetylenesunder transition-metal-free conditions is described. Potassium phosphate was used as an effective additive to enhance the reaction yield and selectivity. Z-Vinyl sulfides were predominately formed in the presence of potassium phosphate, whereas E-vinyl sulfides were formed under solvent- and base-free
unprecedented geminal olefinic dichalcogenation of alkenyl sulfonium salts with dichalcogenides ArYYAr (Y = S, Se, Te) is reported, providing various trisubstituted 1,1-dichalcogenalkenes [Ar1CH = C(YAr2)2] in a highly selective manner under mild and catalyst-free conditions. The key process involves the formation of two geminal olefinic C–Y bonds viasequential C–Y cross-coupling and C–H chalcogenation. A