碘代芳烃(碘代苯和2-碘代噻吩)和碘代烯烃(1-碘代环己烯,1-碘代-4-叔丁基环己烯,1-碘-2-甲基环己烯和1-碘-1-(1-萘基)乙烯)被用作底物N,O-二甲基羟胺在钯催化的氨基羰基化反应中的作用。当使用强制条件(40-60 bar CO,50°C)时,可以以较高的分离产率(高达87%)制备相应的Weinreb酰胺。氨基羰基化在化学选择性反应中提供了作为纯产物的Weinreb酰胺。除了2-碘噻吩外,即使在60 bar的CO压力下也未观察到由于双CO插入而导致的酮甲酰胺的形成。
High-yielding synthesis of Weinreb amides via homogeneous catalytic carbonylation of iodoalkenes and iodoarenes
作者:Attila Takács、Andrea Petz、László Kollár
DOI:10.1016/j.tet.2010.04.076
日期:2010.6
1-iodo-1-(1-naphthyl)ethene) were used as substrates in palladium-catalysed aminocarbonylation with N,O-dimethylhydroxylamine. The corresponding Weinreb amides were prepared in high isolated yields (up to 87%) when forcing conditions (40–60 bar of CO, 50 °C) were used. The aminocarbonylation provides the Weinreb amides as pure products in a chemoselective reaction. No formation of ketocarboxamides, due to double CO
碘代芳烃(碘代苯和2-碘代噻吩)和碘代烯烃(1-碘代环己烯,1-碘代-4-叔丁基环己烯,1-碘-2-甲基环己烯和1-碘-1-(1-萘基)乙烯)被用作底物N,O-二甲基羟胺在钯催化的氨基羰基化反应中的作用。当使用强制条件(40-60 bar CO,50°C)时,可以以较高的分离产率(高达87%)制备相应的Weinreb酰胺。氨基羰基化在化学选择性反应中提供了作为纯产物的Weinreb酰胺。除了2-碘噻吩外,即使在60 bar的CO压力下也未观察到由于双CO插入而导致的酮甲酰胺的形成。