Polyoxometalate-based ionic liquids: efficient reversible phase transformation-type catalysts for thiolation of alcohols to construct C–S bonds
作者:Jikun Li、Junwei Ma、Chuanping Wei、Zebao Zheng、Yinfeng Han、Huiping Wang、Xueshen Wang、Changwen Hu
DOI:10.1039/d4dt00046c
日期:——
catalytic system had a wide substrate scope and was suitable for the reaction of tertiary and secondary benzyl alcohols with thiophenols or cycloalkyl thiols. In particular, [PIMPS]3PW12O40 (PIM = 1-propylimidazole, PS = propane sulfonate) as a reversible phase transformation-type catalyst, combining the advantages of homogeneous and heterogeneous catalysts, exhibited high activity and good recyclability with
作为天然产物和有机合成的重要组成部分,硫醚具有广泛的潜在应用。在此,合成了源自N-烷基咪唑的多金属氧酸盐基离子液体(POM-ILs-SO 3 H),并首次用于醇的硫醇化,以在一系列苄基硫醚中构建C-S键。该类型的POM-ILs-SO 3 H催化剂表现出较高的催化活性,在70℃下1小时内硫醚收率高达98%。咪唑烷基链长度对POM-ILs-SO 3 H催化剂在反应溶剂中的溶解度有一定影响,进而影响其催化活性。该催化体系底物范围宽,适用于叔、仲苯甲醇与苯硫酚或环烷基硫醇的反应。特别是[PIMPS] 3 PW 12 O 40 (PIM=1-丙基咪唑,PS=丙烷磺酸盐)作为可逆相变型催化剂,结合了均相和非均相催化剂的优点,仅用五次运行后产量略有下降。此外,还提出了醇的硫醇化反应的碳正离子机理。