Rhodium-Catalyzed Nondecarbonylative Addition Reaction of ClCOCOOC2H5 to Alkynes
作者:Ruimao Hua、Shun-ya Onozawa、Masato Tanaka
DOI:10.1002/chem.200401279
日期:2005.6.6
Addition of ethoxalyl chloride (ClCOCOOEt) to terminal alkynes at 60 degrees C in the presence of a rhodium(I)-phosphine complex catalyst chosen from a wide range affords 4-chloro-2-oxo-3-alkenoates regio- and stereoselectively. Functional groups such as chloro, cyano, alkoxy, siloxy, and hydroxy are tolerated. The oxidative addition of ethoxalyl chloride to [RhCl(CO)(PR(3))(2)] proceeds readily at