Coupling and cycloaddition of ynamides: homo- and Negishi coupling of tosylynamides and intramolecular [4+2] cycloaddition of N-(o-ethynyl)phenyl ynamides and arylynamides
作者:María Fernanda Martínez-Esperón、David Rodríguez、Luis Castedo、Carlos Saá
DOI:10.1016/j.tet.2005.11.082
日期:2006.4
tosylamides derivatives with (hetero)aryl iodides in the presence of Pd2dba3 and triphenylphosphine affords N-aryl and N-alkyl arylynamides in yields of up to 90%. Intramolecular [4+2] cycloaddition reactions of N-ethynylphenyl ynamides and arylynamides allow the synthesis of carbazoles and benzannulated and heteroannulated carbazoles in moderate-to-good yields.
N,N'-芳基-和N,N'-烷基-buta -1,3-diyne-1,4-ditosylamides的第一次合成是通过铜催化相应的二聚反应,收率非常好。N-芳基或N-烷基甲苯磺酰基酰胺。在Pd 2 dba 3和三苯基膦的存在下,N-乙炔基锌甲苯磺酰胺衍生物与(杂)芳基碘化物的Negishi偶联,以高达90%的产率提供N-芳基和N-烷基芳基炔基酰胺。N的分子内[4 + 2]环加成反应-乙炔基苯基炔基酰胺和芳基炔基酰胺可以中等至良好的产率合成咔唑,苯并环化和杂环化的咔唑。