Microwave-assisted Cadogan reaction for the synthesis of 2-aryl-2<i>H</i>-indazoles, 2-aryl-1<i>H</i>-benzimidazoles, 2-carbonylindoles, carbazole, and phenazine
mixed with triethylphosphite or triphenylphosphine and irradiated with microwaves for several minutes at a specific power to give the desired products. The indazoles were prepared by irradiating N‐(2‐nitrobenzylidene) anilines with triethylphosphite at 200 W for 12–14 min to give 85–92% product yields. Irradiation of the mixture of N‐benzylidene‐2‐nitroanilines and triphenylphosphine at 200 W for
Palladium-Catalyzed Formation of<i>N</i>-Heteroarenes from Nitroarenes using Molybdenum Hexacarbonyl as the Source of Carbon Monoxide
作者:Fei Zhou、Duo-Sheng Wang、Tom G. Driver
DOI:10.1002/adsc.201500700
日期:2015.11.16
The development of a method that employs a two-chamber reaction vessel and uses molybdenum hexacarbonyl [Mo(CO)6] as the carbon monoxide (CO) source for the palladium-catalyzed transformation of nitroarenes into indoles or imidazoles is reported. The scope and limitations of our method are illustrated with 23 examples. Experiments that indicate the mechanism of the CH bond amination reaction to be