Pd-Catalyzed Decarbonylative Heck Olefination of Aromatic Carboxylic Acids Activated in situ with Di-<i>tert</i>-butyl Dicarbonate
作者:Lukas J. Gooßen、Jens Paetzold、Lars Winkel
DOI:10.1055/s-2002-34227
日期:——
The first protocol for a direct Heck olefination of aromatic carboxylic acids has been developed. By treatment with commercially available di-tert-butyl dicarbonate, the carboxylic acids are converted in situ into the mixed anhydrides, which in the presence of a palladium catalyst react with olefins to give styrene derivatives. As by-products, only volatile CO and CO2 along with tert-butanol are formed, making the work-up of the reaction products particuarly easy. A mixture of PdCl2, LiCl and γ-picoline was identified to be the most effective catalyst system.
已经开发出一种直接的芳香族羧酸Heck烯化的首个协议。通过与商业可得的二叔丁基二碳酸酯处理,羧酸在原位转化为混合酸酐,在钯催化剂的存在下与烯烃反应,生成苯乙烯衍生物。作为副产物,仅生成挥发性的CO和CO2以及叔丁醇,使反应产物的后处理特别简单。 PdCl2、LiCl和γ-吡啶的混合物被确定为最有效的催化剂体系。