Convenient primary amidation of N-protected phenylglycine and dipeptides without racemization or epimerization
作者:Takuya Noguchi、Seunghee Jung、Nobuyuki Imai
DOI:10.1016/j.tetlet.2013.11.042
日期:2014.1
Primary amidation of N-protected phenylglycine and dipeptide proceeded easily to afford the corresponding amides in 57–95% yields with 99% ee and 81–99% de, respectively. The procedure is very easy to avoid racemization and epimerization of the products in the reactions by keeping exactly the reaction temperature at −15 °C when the activation of carboxylic acids, followed by the reaction of the mixed