A versatile new synthesis of quinolines and related fused pyridines, Part 5. The synthesis of 2-chloroquinoline-3-carbaldehydes
作者:Otto Meth-Cohn、Bramha Narine、Brian Tarnowski
DOI:10.1039/p19810001520
日期:——
Acetanilides are converted into 2-chloroquinoline-3-carbaldehydes in good yield by the action of Vilsmeier's reagent in phosphoryl chloride solution. The reaction is shown to involve successive conversion of the acetanilide in to an imidoyl chloride and then an N-(α-chlorovinyl)aniline. The latter enamine is diformylated at its β-position and subsequently cyclised to the chloroquinolinecarbaldehyde