A sulfonating ionic liquid for one-pot pseudo four-component synthesis of novel 3-chlorosulfonyl-delta-sultones: A novel class of fluorescent compounds

摘要

An active imidazolium-based ionic liquid mixture was developed for efficient synthesis of some novel 4,6-diary)-3-(chlorosulfonyl)-1,2-oxathiine-2,2-dioxides (chlorosulfonyl-delta-sultones) from simple acetophenones at room temperature. The ionic liquid mixture acts as a catalyst to condense two molecules of an acetophenone derivative and as a mild sulfonating agent to convert the resulting condensate into 4,6-diaryl-1,2-oxathiine-2,2-dioxides, and finally as a chlorosulfonating reagent to deliver the desired fully unsaturated chlorosulfonyl-delta-sultones in onepot. The products were separated easily from the reaction mixture and showed valuable fluorescence properties. The structures of these products are in good agreement with their H-1 NMR, C-13 NMR, and mass spectral data. All rights reserved. (C) 2018 Elsevier Ltd. All rights reserved.