Microwave-Promoted Efficient Synthesis of Benzo[h]quinolines by Solvent-Free Three-Component Imino-Diels-Alder Reaction under One-Pot Conditions
作者:Dipak Prajapati、Manas Sarmah、Debajyoti Bhuyan
DOI:10.1055/s-0033-1339844
日期:——
An one-pot, solvent-free imino Diels–Alder reaction has been developed under microwave conditions using 1-naphthylamine, aldehydes, and electron-deficient terminal alkynes in the presence of a catalytic amount of In(OTf)3 for construction of benzo[h]quinoline derivatives in short reaction times. The method is clean and operationally simple.
Three-component reactions of ethyl/methyl lactate, anilines and aldehydes providing quinolines have been developed via simple iron(III) chloride catalysis without using an additional organic medium or external oxidant. This three-component protocol shows high efficiency and broad substrate tolerance, allowing quick access to diverse quinoline products under neat reaction conditions. The results reported