We have developed a palladium-catalyzed thiocarbonylation through the reaction of a σ-alkyl palladium intermediate with carbonmonoxide and a triisopropylsilyl (TIPS) thioether. The use of CsF, (IPr)Pd(allyl)Cl [IPr =1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene], CO, and a TIPS thioether in THF are key to obtaining alkyl and aryl thioesters in high yields. The yield of the palladium-catalyzed thiocarbonylation
A palladium-catalyzed carbothiolation via the reaction of a σ-alkyl palladium intermediate with a TIPS thioether is described. It was found that the use of Cs2CO3, (IPr)Pd(allyl)Cl, and a TIPS thioether was key to obtaining alkyl aryl and dialkyl sulfides in high yield through the reaction of a σ-alkyl palladium intermediate. The developed reaction is applicable to a wide range of substrates and thiols
描述了通过σ-烷基钯中间体与TIPS硫醚反应的钯催化的羰基硫醇化。发现使用Cs 2 CO 3,(IPr)Pd(烯丙基)Cl和TIPS硫醚是通过σ-烷基钯中间体反应以高收率获得烷基芳基和二烷基硫化物的关键。所开发的反应适用于多种底物和硫醇。
Carbon-Sulfur Bond Formation of Challenging Substrates at Low Temperature by Using Pd-PEPPSI-IPent
作者:Mahmoud Sayah、Michael G. Organ
DOI:10.1002/chem.201102158
日期:2011.10.10
bromides and chlorides has been achieved under the most mild temperatures yet reported (i.e., room temperature to 40 °C). The bulk afforded by the di‐2,6‐(3‐propylphenyl)imidazolium‐derived Pd‐PEPPSI‐IPent catalyst is believed to actively promote the critical reductive elimination step of the catalytic cycle, thereby eliminating the formation of poisonous off‐cycle dimeric resting states that have plagued