A simple and practical thio-Michael addition of α,β-unsaturatedamides catalyzed by Nmm-based ionic liquids with a 1,2-propanediol group has been developed. All the α,β-unsaturatedamides without substituents at the carbon end could smoothly react with sulfur-nucleophiles in water. Meanwhile for thio-Michael addition of α,β-unsaturatedamides with substituents at the carbon end, the relevant product
Crown Ether Complex Cation Ionic Liquids: Preparation and Applications in Organic Reactions
作者:Yingying Song、Huanwang Jing、Bo Li、Dongsheng Bai
DOI:10.1002/chem.201100112
日期:2011.7.25
cation ionicliquids (CECILs) were designed, synthesised and characterised by NMR spectroscopy, HRMS, thermogravimetric differential thermal analysis (TG‐DTA) and elemental analysis. Their applications in various organic reactions were investigated: [15‐C‐5Na][OH], [15‐C‐5Na][OAc], [18‐C‐6K][OH] and [18‐C‐6K][OAc] (15‐C‐5=[15]crown‐5; 18‐C‐6=[18]crown‐6) efficiently catalysed the Michael addition of alkenes
A series of novel N-methyl piperidine (Nmp)-based ionic liquids with 1,2-propanediol group are synthesized and used as catalysts for both hetero-Michael addition of alpha,beta-unsaturated amides and Knoevenagel condensation at room temperature in water; and all the examined substrates could be transformed into corresponding products in good to excellent yields. Meanwhile IL-catalyzed hetero-Michael addition of alpha,beta-unsaturated amides in water has not been reported in the previous literatures. Additionally, the catalyst is recyclable for the two reactions. This finding provides a green catalyst for both hetero-Michael addition of alpha,beta-unsaturated amides and Knoevenagel condensation in water.
Catalyst-free oxidation of sulfides to sulfoxides and diethylamine catalyzed oxidation of sulfides to sulfones using Oxone as an oxidant
作者:R. V. Kupwade、S. S. Khot、U. P. Lad、U. V. Desai、P. P. Wadgaonkar
DOI:10.1007/s11164-017-3026-0
日期:2017.12
journey from the failure of our attempts in controlled oxidation of sulfides to sulfoxides using an Oxone®–KBr combination to our success in the development of a catalyst-free protocol for the oxidation of sulfides to sulfoxides using Oxone as an oxidant. We also describe the failure of our attempts at the oxidation of sulfides to sulfonesusing an excess of Oxone–KBr as well as Oxone, and our success