Visible light photocatalysis with benzophenone for radical thiol-ene reactions
作者:Manjula Singh、Arvind K. Yadav、Lal Dhar S. Yadav、R.K.P. Singh
DOI:10.1016/j.tetlet.2017.04.060
日期:2017.6
for an anti-Markovnikov hydrothiolation of unactivated olefins using benzophenone as an inexpensive photocatalyst at room temperature. Anti-Markovnikov adducts of a wide variety of olefins and thiols are formed in highly regioselective manner and good to excellent yields. The present radical thiol-ene reaction is operationally simple and well tolerates a variety of functional groups.
Thiol-Ene “Click” Reaction Triggered by Neutral Ionic Liquid: The “Ambiphilic” Character of [hmim]Br in the Regioselective Nucleophilic Hydrothiolation
作者:Rajesh Kumar、Saima、Amit Shard、Nitin H. Andhare、Richa、Arun K. Sinha
DOI:10.1002/anie.201408721
日期:2015.1.12
the “ambiphilic” character of the ionicliquid promotes the nucleophilic addition of thiol to styrene through an anti‐Markovnikov pathway. The catalyst recyclability and the extension of the methodology for thiol–yne click chemistry are additional benefits. A competitive study among thiophenol, styrene, and phenyl acetylene revealed that the rate of reaction is in the order of thiol–yne>thiol–ene>dimerization
硫醇-“咔嗒”化学已成为构建碳-杂原子(CS)键的有力策略,通常会形成两个区域异构体。为此,已经探索了中性离子液体[hmim] Br作为溶剂兼催化剂,用于从活化和失活的苯乙烯衍生物或仲苄醇和硫醇合成线性硫醚,而无需使用金属络合物,碱或自由基引发剂。此外,使用1进行详细的机械研究1 H NMR光谱和四极杆飞行时间电喷雾电离质谱(Q-TOF ESI-MS)表明,离子液体的“两亲”特性通过反马尔可夫尼科夫途径促进了巯基与苯乙烯的亲核加成。催化剂的可回收性和硫醇-炔点击化学方法的扩展是其他好处。硫酚,苯乙烯和苯基乙炔之间的竞争研究表明,反应速率为[hmim] Br中的硫醇-炔>硫醇-烯>硫醇二聚的顺序。