The Ru(II)-catalyzed C-H activation and annulation reaction of salicylaldehydes and disubstitutedalkynes affords chromones in high yields. This reaction works with terminal alkynes also and tolerates wide range of sensitive...
Microwave-accelerated, palladium-catalyzed carbonylative cyclization reactions of 2-iodophenol with alkynes Rapid and efficient synthesis of chromen-2-one derivatives
作者:Hong Cao、Wen-Jing Xiao
DOI:10.1139/v05-094
日期:2005.6.1
Rapid palladium-catalyzed carbonylative cyclization reactions of 2-iodophenol with various alkynes have been carried out by the use of commercially available molybdenumhexacarbonyl as a convenient and solid carbonmonoxidesource. The reactions were conducted at 160 °C for 30 min with microwave heating in the presence of DIEA and DMAP in 1,4-dioxane, and afford the corresponding chromen-2-one derivatives
An intermolecular nickel-catalyzed [4 + 2] cycloaddition has been developed where carbonylsalicylamides react with alkynes to afford substituted chromones. The reaction involves an elimination of i...