A novel regioselective synthesis of 2-aminoquinolines and 2-arylquinoline-3-carbonitriles is described via copper-mediated tandem reaction. Formation of substituted quinolines involves Knoevenagel condensation of ortho-bromobenzaldehyde with active methylene nitriles followed by copper-catalyzed reductive amination and intramolecular cyclization.
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/Zn powder: An efficient, chemoselective reducing catalyst for the microwave‐assisted synthesis of 2,3‐disubstituted quinolines via tandem Knoevenagel condensation
作者:Syed Tasqeeruddin、Yahya I. Asiri、Syeda Shaheen
DOI:10.1002/jhet.4203
日期:2021.2
An efficient, a hitherto unreported, sustainable, and environmentally friendly microwave‐assisted synthesis of 2,3‐disubstituted quinolines by reductive cyclization of 2‐nitrobenzaldehydes and various active methylene compounds via tandem Knoevenagel condensation promoted by an efficient eco‐friendly, chemoselective reducing catalyst ammonium chloride (NH4Cl) and zinc powder was developed. This present