A simple metal-free, step-economic and selective access to pyridines from readily available substrates is reported, involving a flexible 4 A molecular sieves promoted Michael addition initiated domino three-component reaction between a 1,3-dicarbonyl, a Michael acceptor and a synthetic equivalent of ammonia.
Metal-Free Michael-Addition-Initiated Three-Component Reaction for the Regioselective Synthesis of Highly Functionalized Pyridines: Scope, Mechanistic Investigations and Applications
and completely regioselective three-componentsynthesis of highly functionalizedpyridines from 1,3-dicarbonyl derivatives and Michael acceptors has been achieved. Activated Michael acceptors, that is, β,γ-unsaturated α-oxo carbonyl derivatives, were utilized, allowing substitution at the 4-position and remarkable functional diversity at the 2-position of the pyridine ring. The scope and limitations
A new process for preparing 5-oxo-tetrahydroquinolines comprises condensing a compound of formula II with a ##STR1## compound of formula III to obtain a compound of formula I wherein R, R.sup.1, R.sup.2 and R.sup.3 are selected from hydrogen or alkyl, aralkyl or aryl groups, Y is NH.sub.2 or OH accompanied by an ethylenic bond or Y is oxo and the double bond is absent and A is an amino or lower alkoxy group of 1-4 carbon atoms at least one of Y or A being amino. Compounds of formula I are intermediates for pharmaceuticals.