Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... A facile and regioselective synthesis of pyridin-2-ones from acylated aminoazabutadienes is described. ... Acylaminoazabutadienes undergo metallation and ring closure when treated with LDA, to give pyridin-2(1H)-ones. Pyridin-2(3H)-ones are obtained when R 4 , R 6 = Me.