Various 2-amino-3-cyanoindoles are synthesized through copper catalyzed intramolecular N-arylations of ketene aminals at room temperature for the first time with 60–99% yields within 0.1–2 h. Controlled regioselective N-arylations of unsymmetrical ketene aminals are also studied. Further, a new double heteroannulation approach is demonstrated for the synthesis of 11-aminoindolo[2,3-b]quinolines from
在室温下首次通过铜催化乙烯酮缩醛的分子内N-芳基化反应合成了各种2-氨基-3-氰基吲哚,其收率在0.1-2 h内达到60-99%。还研究了不对称乙烯酮缩醛的可控区域选择性N-芳基化。此外,从非环和非杂环的前体合成11-氨基吲哚并[2,3- b ]喹啉的新的双异环的方法被证明。
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