We report on the synthesis of 1,2,4-triazoles substituted with 2 or 3 aminoacid side chains, using silver benzoate as a key reagent for the cyclization step. A complete study of the optical purity retention during the synthetic process leading to these compounds is described. In addition an improved work-up after the addition-cyclization step was also established leading to better yields and metal-free
Chemo- and Site-Selective Replacement of N-Terminal Carbamates in Peptides
作者:Miho Ibara、Takumi Abe、Daisuke Sawada
DOI:10.1021/acs.orglett.2c00370
日期:2022.3.25
synthesis, it is important to distinguish the terminal aminogroup and carry out the selective transformation of only the N-terminal protectinggroup. We describe herein a reaction for the chemo- and site-selective replacement of carbamates with various other carbamates only at the N-terminus of peptides. We demonstrate the scope of carbamates and peptides and the introduction of fluorine into a peptide