Synthesis of N-picolylcarboxamides via palladium-catalysed aminocarbonylation of iodobenzene and iodoalkenes
作者:Máté Gergely、Roland Farkas、Attila Takács、Andrea Petz、László Kollár
DOI:10.1016/j.tet.2013.11.087
日期:2014.1
carboxamide and ketocarboxamide mixtures under various conditions, with the predominant formation of ketocarboxamide even at low carbon monoxide pressure, the aminocarbonylation of iodoalkenes under same conditions gave the corresponding unsaturated carboxamide exclusively. Most of the carboxamides and phenylglyoxylamides, obtained via single and double carbon monoxide insertion, respectively, were isolated
碘苯的钯催化氨基羰基化的系统的调查,1- iodocyclohexene和在存在1'-碘苯乙烯Ñ -nucleophiles含有吡啶基部分(2-,3-和4-吡啶甲基胺,Ñ进行了-乙基-4-吡啶甲基胺,二(2-吡啶甲基)胺的制备。两种类型的碘代底物在羰基化选择性上有很大不同:碘代苯的氨基羰基化导致在各种条件下形成羧酰胺和酮羧酰胺混合物,即使在低一氧化碳压力下也主要形成酮羧酰胺,而碘代烯烃的氨基羰基化则在不同条件下进行。在相同条件下,仅给出相应的不饱和羧酰胺。分别通过单次和两次一氧化碳插入获得的大多数羧酰胺和苯乙氧基叠氮化物均以合成目的的收率(最高可达86%)分离。用二-(2-吡啶甲基)胺作为N时观察到低的反应速率和对羧酰胺形成的出乎意料的化学选择性-亲核试剂在碘苯的氨基羰基化反应中。