Direct introduction of acetylene moieties into azines by methodology
摘要:
The N-oxides of azines 1a-g react with lithium and/or potassium acetylides to give the corresponding ethynylazines 2a-g. Reaction with lithium acetylide requires subsequent acylation of the intermediate anionic adduct for rearomatization whereas in the case of potassium acetylide, auto-aromatization takes place. (C) 2009 Published by Elsevier Ltd.