Catalytic role of PPh3 and its polymer bound analog in the amidation of carboxylic acids mediated by 2,4,6-trichloro-1,3,5-triazine
作者:Chuthamat Duangkamol、Subin Jaita、Sirilak Wangngae、Wong Phakhodee、Mookda Pattarawarapan
DOI:10.1016/j.tetlet.2015.07.012
日期:2015.8
The catalytic role of PPh3 and its polymer bound analog was investigated in the 2,4,6-trichloro-1,3,5-triazine (TCT) mediated amidation of carboxylic acids. In the presence of inorganic bases which were inert toward TCT, carboxylic acids rapidly reacted with amines to afford amides in good to excellent yields. The described method also enabled the synthesis of optically active protected dipeptides
在2,4,6-三氯-1,3,5-三嗪(TCT)介导的羧酸酰胺化反应中,研究了PPh 3及其与聚合物结合的类似物的催化作用。在对TCT呈惰性的无机碱的存在下,羧酸与胺迅速反应,以良好或优异的收率得到酰胺。所描述的方法还能够在没有外消旋的情况下合成旋光保护的二肽。根据31 P NMR研究证实,在PPh 3催化的酸活化过程中形成了三嗪基氯化chloride 。