The reaction of the readily available o-ethynyltrifluoroacetanilide with aryl iodides in the presence of catalytic amounts of Pd2dba3, an excess of K2CO3, in DMSO at 40 °C affords 2-unsubstituted-3-arylindoles in good yield. Subjection of o-ethynyltrifluoroacetanilide to the same reaction conditions in the absence of aryl iodides gives rise to the formation of indole in high yield.
易得的o-
乙炔基
三氟乙酰苯胺与芳基
碘化物在催化量Pd2dba3和过量K2CO3的存在下,在
DMSO中于40°C反应,提供了良产率的2-未取代-3-芳基
吲哚。将o-
乙炔基
三氟乙酰苯胺在没有芳基
碘化物的相同反应条件下进行反应,则能高产率地生成
吲哚。