Transition metal and base free coupling of N-tosylhydrazones with 1,3-dicarbonyl compound
摘要:
N-tosylhydrazones derived from a wide variety of aryl, alkyl and heteroaryl aldehydes undergo smooth coupling with 5,5-dimethylcyclohexane-1,3-dione under transition metal and base free conditions to generate tetraketo compounds in high yields. In presence of a base, the coupling reaction generates beta-keto enol ether as the major product in a polar aprotic solvent. N-Tosylhydrazone can also be converted to xanthenedione in high yields in one-pot operation under mild acidic conditions. (C) 2017 Elsevier Ltd. All rights reserved.
A new type IV DES: a competent green catalyst and solvent for the synthesis of α,β-unsaturated diketones and dicyano compounds by Knoevenagel condensation reaction
作者:M. Shaibuna、K. Hiba、Letcy V. Theresa、K. Sreekumar
DOI:10.1039/d0nj02852e
日期:——
greener alternatives to ionicliquids formed by mixing components that are capable of forming hydrogen bonds between them. The strong hydrogen bond interactions between the constituents make a large depression in the melting points compared to pure constituents. They are emerging as green solvents and have loomed as adorable alternatives to conventional organic solvents and ionicliquids with unique properties