A base-controlled synthesis of 2-substituted secondary and tertiary 1H-indole-3-carboxamides through PdCl2-catalyzed cyclization of o-alkynyltrifluoroacetanilides followed by isocyanide insertion has been developed. The reaction proceeds smoothly at ambient temperature using O2 in air as the sole oxidant of the palladium catalyst.
开发了一种通过PdCl2催化的o-炔基
三氟乙酰苯胺的环化反应,随后进行异
氰化物插入,合成2-取代的二级和三级1H-
吲哚-3-羧酰胺的基控合成方法。在室温下,使用空气中的O2作为
钯催化剂的唯一氧化剂,反应顺利进行。