Peptide Bond Formation of Amino Acids by Transient Masking with Silylating Reagents
作者:Wataru Muramatsu、Hisashi Yamamoto
DOI:10.1021/jacs.1c02600
日期:2021.5.12
A one-pot peptide bond-forming reaction has been developed using unprotected amino acids and peptides. Two different silylating reagents, HSi[OCH(CF3)2]3 and MTBSTFA, are instrumental for the successful implementation of this approach, being used for the activation and transient masking of unprotected amino acids and peptides at C-termini and N-termini, respectively. Furthermore, CsF and imidazole
9-(4-Bromophenyl)-9-fluorenyl as a Safety-Catch Nitrogen Protecting Group
作者:Simon Surprenant、William D. Lubell
DOI:10.1021/jo0521910
日期:2006.1.1
(BrPhF) group has been developed as a novel safety-catch amine protection. This relatively acid-stable protectinggroup can be successfully activated by palladium-catalyzed cross-coupling reaction of the aryl bromide with morpholine and then cleaved effectively under mild conditions using dichloroacetic acid and triethylsilane. Complementary conditions are reported for selectiveremoval of the BrPhF