期刊
RSC ADVANCES
卷 4, 期 6, 页码 2678-2686出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ra46599c
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资金
- MIUR (Ministero Italiano dell'Universita e della Ricerca)
This paper presents an efficient one-pot protocol for the sequential deprotection/reprotection of the alpha-amino group in alpha-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 alpha-amino function under very mild conditions. N-Boc-alpha-amino acid as well as peptide derivatives are isolated in excellent yields, and do not require any further purification. Absolute configurations of the precursors are totally preserved during the process.
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