Synthesis of macrocyclic enaminolactams by ring expansion reaction of 2-oxocyclododecane-1-carbonitrile with diarylcarbodiimides
作者:Wladislaw Ivancev、Vassil I. Ognyanov、Manfred Hesse
DOI:10.1016/0040-4020(96)00090-7
日期:1996.3
A base promoted ringexpansionreaction of 2-oxocyclododecane-1-carbonitrile (6) with several diarylcarbodiimides gives 14-membered α-enaminolactams (12–17), whereas N-alkyl-N′-aryl- and N,N′-dialkylcarbodiimides do not react at all. This new process seems to occur by a similar mechanism as some recently reported analogue reactions of heterocumulenes with cycloalkanones. All relevant molecular structures