Functionalization of indole at C-5 or C-7 via palladium-catalysed double carbonylation. A facile synthesis of indole ketocarboxamides and carboxamide dimers
作者:Attila Takács、Diána Marosvölgyi-Haskó、Zsuzsanna Kabak-Solt、Liliana Damas、Fábio M.S. Rodrigues、Rui M.B. Carrilho、Marta Pineiro、Mariette M. Pereira、László Kollár
DOI:10.1016/j.tet.2015.11.007
日期:2016.1
Palladium-catalysed aminocarbonylation of 7-iodoindole derivatives (the parent compound and 5-bromo-7-iodoindole), as well as 5-iodoindole with various primary and secondary amines, including amino acid esters and chiral diamines, was carried out. In this way, a highly selective double carbonylation reaction at the C-7 was performed resulting in the formation of the corresponding indol-7-ylglyoxylamides
进行了钯催化的7-碘吲哚衍生物(母体化合物和5-bromo-7-碘吲哚)以及5-碘吲哚与各种伯胺和仲胺(包括氨基酸酯和手性二胺)的氨基羰基化反应。这样,当使用单胺时,在C-7上进行了高度选择性的双羰基化反应,导致形成了相应的吲哚-7-乙醛酰乙二酰亚胺。溴芳烃部分保持完好无损,因此已经以中等至高收率合成了具有实际重要性的溴取代的乙氧化乙酰胺。使用手性烷基和芳基二胺作为亲核试剂,可以在中等反应条件(10 bar,100°C)下合成新的二聚7-吲哚衍生物家族。 碘吲哚的氨基羰基化反应显示出极大不同的化学选择性,这取决于胺的碱性,而高碱性的伯胺和仲胺则可产生高达98%的化学选择性的2-酮羧酰胺,苯胺几乎导致了相应羧酰胺产物的排他性形成。