Metal-free direct amidation of peptidyl thiol esters with α-aminoacid esters in the presence of bis(trimethylsilyl) acetamide (BSA) has been developed. This general method provides convenient access to N-protected peptides in good yields under mild conditions and demonstrates a high tolerance to functionality.
Direct Amidation of Amino Acid Derivatives Catalyzed by Arylboronic Acids: Applications in Dipeptide Synthesis
作者:Shouxin Liu、Yihua Yang、Xinwei Liu、Farhana K. Ferdousi、Andrei S. Batsanov、Andrew Whiting
DOI:10.1002/ejoc.201300560
日期:2013.9
The direct amidation of aminoacidderivatives catalyzed by arylboronic acids has been examined. The reaction was generally slow relative to simple amine-carboxylic acid combinations though proceeded at 65–68 °C generally avoiding racemization. 3,4,5-Trifluorophenylboronic and o-nitrophenylboronic acids were found to be the best catalysts, though for slower dipeptide formations, high catalyst loadings
HMDO-Promoted Peptide and Protein Synthesis in Ionic Liquids
作者:Jianli Duan、Yao Sun、Hao Chen、Guofu Qiu、Haibing Zhou、Ting Tang、Zixin Deng、Xuechuan Hong
DOI:10.1021/jo400797t
日期:2013.7.19
Hexamethyldisiloxane (HMDO) has been developed to efficiently promote the metal-free direct coupling of an amino function of one cysteine-free peptide or protein and a C-terminal thioester of the second peptide in ionic liquids. The amide-coupling reaction proceeds smoothly under mild conditions to afford the corresponding products in good to excellent yields (63-94%). Peptide couplings were also achieved using in-situ-generated thioesters by the thioesterification of oxo esters.