Deprotection/reprotection of the amino group in α-amino acids and peptides. A one-pot procedure in [Bmim][BF<sub>4</sub>] ionic liquid
作者:M. L. Di Gioia、A. Barattucci、P. Bonaccorsi、A. Leggio、L. Minuti、E. Romio、A. Temperini、C. Siciliano
DOI:10.1039/c3ra46599c
日期:——
of the α-amino group in α-amino acid and dipeptide methyl esters. [Bmim][BF4] is used as the solvent in the entire process. In particular, the use of the ionic liquid allows for rapid and clean removal of the 4-nitrobenzenesulfonyl (nosyl) group and for facile subsequent tert-butyloxycarbonylation of the free α-amino function under very mild conditions. N-Boc-α-amino acid as well as peptide derivatives
本文提出了一种有效的一锅法,用于依次对α-氨基酸和二肽甲酯中的α-氨基进行脱保护/再保护。在整个过程中,[Bmim] [BF 4 ]被用作溶剂。特别地,离子液体的使用允许在非常温和的条件下快速和干净地除去4-硝基苯磺酰基(nosyl)基团,并且随后易于进行游离α-氨基官能团的叔丁氧基羰基化。分离N -Boc-α-氨基酸以及肽衍生物的产率很高,不需要进一步纯化。在此过程中,前体的绝对构型被完全保留。