Highly Chemo- and Regioselective Thiocarbonylation of Conjugated Enynes with Thiols and Carbon Monoxide Catalyzed by Palladium Complexes: An Efficient and Atom-Economical Access to 2-(Phenylthiocarbonyl)-1,3-dienes
作者:Wen-Jing Xiao、Giuseppe Vasapollo、Howard Alper
DOI:10.1021/jo9824246
日期:1999.3.1
3-conjugated enynes bearing a terminal triple bond with thiols and carbonmonoxide in the presence of catalytic quantities of Pd(OAc)(2) (3 mol %) and 1,3-bis(diphenylphosphino)propane (6 mol %) in THF at 110 degrees C gave 2-(phenylthiocarbonyl)-1,3-dienes in moderate to good yields. The thiocarbonylation takes place with high chemo- and regioselectivity, with the attack by the phenylthiocarbonyl group occurring
Ligandless Copper-Catalyzed Carboborylation of Heteroatom-Substituted Alkynes
作者:Shiwen Liu、Xiaojun Zeng、Bo Xu
DOI:10.1002/adsc.201800656
日期:2018.9.3
We have developed an efficient ligand‐free copper‐catalyzed regio‐ and stereoselective carbo‐borylation of heteroatom‐substituted internal alkynes using bis(pinacolato)diboron as boron source and alkyl halides as an electrophile. Both chemical yields and functional group tolerance are excellent. Our method provides an efficient synthesis of tri‐ and tetra‐substituted alkenylboronates which could be
Hydroalumination of phenylthioacetylenes. Synthesis and reactions of ( Z )- and ( E )-1-butyltelluro-1-phenylthio-1-alkenes
作者:Miguel J Dabdoub、Palimécio G Guerrero
DOI:10.1016/s0040-4039(01)01511-8
日期:2001.10
addition of C4H9TeBr afforded (Z)-telluro(thio)ketene acetals (Z >80–93%). The (E)-isomers were obtained with 100% stereoselectivity by reduction of thioacetylenes with DIBAL-H, followed by the addition of n-BuLi and subsequent treatment with C4H9TeBr. Reaction of the (E)-telluro(thio)ketene acetals with n-BuLi followed by the addition of valeraldehyde afforded the (Z)-phenylthio allylic alcohol as
用Zweifel试剂作为还原剂对苯硫基乙炔进行氢铝化,然后添加C 4 H 9 TeBr,得到(Z)-碲(硫代)乙烯酮缩醛(Z > 80-93%)。通过用DIBAL-H还原硫代乙炔,然后加入正丁基锂并随后用C 4 H 9 TeBr处理,以100%的立体选择性获得(E)-异构体。(E)-碲(硫代)乙烯酮缩醛与正丁基锂反应,然后加入戊醛,得到(Z)-苯硫基烯丙醇为主要产物,并痕量(E)异构体,而(Z)-和(E)-碲(硫代)乙烯酮缩醛的混合物在相似的反应条件下仅得到(E)-苯硫基烯丙基醇。
Synthesis of thiolesters from thioacetylenes
作者:Antonio L. Braga、Oscar E.D. Rodrigues、Elisabete de Avila、Claudio C. Silveira
DOI:10.1016/s0040-4039(98)00531-0
日期:1998.5
Thiolesters were conveniently prepared in good yields by reacting thioacetylenes with p-toluenesulfonic or trifluoracetic acid in dichloromethane in the presence of silica
Highly dispersed nano‐copper catalyst on porous polyvinyl chloride for highly regioselective borylation of alkynes
作者:Wenna Xie、Shiwen Liu
DOI:10.1002/aoc.6951
日期:2023.1
developed a highlyregioselective synthesis of multi-substituted alkenylboronates via a heterogeneous ligand-free nano-copper catalyst that was highlydispersed and supported on the porouspolyvinylchloride. In this catalytic system, substituents on the terminal alkynes could affect the configuration of products. Terminal alkynes and general internal alkynes gave β-selective borylation products, whereas