Investigations into the synthesis of oxathiocoraline, a bicyclic depsipeptide with C2 symmetry, revealed a number of unexpected side-reactions that could not be circumvented by classical or standard means. This cyclodepsipeptide has a large number of N-methyl amino acids coexisting with two ester bonds and also shows a branched structure; these features hinder its synthesis. In addition, complexity
N-Methylation of peptides is an important synthetic tool in peptide-based medicinal chemistry. Herein, an optimized strategy for solid-phase synthesis of small but highly N-methylated cyclic peptides is described. The proposed route addresses several problems associated with the synthesis of peptides containing several sequential N-methyl-amino acids, such as in situ N-methylation, difficulty of acylation
Total Synthesis and Biological Evaluation of Modified Ilamycin Derivatives
作者:Jennifer Greve、Axel Mogk、Uli Kazmaier
DOI:10.3390/md20100632
日期:——
ClpP1/ClpP2, forms an essential ATP-driven protease. Derivatives of the ilamycins with a simplified tryptophane unit are synthesized in a straightforward manner. The ilamycin derivative 26 with a cyclic hemiaminal structure is active in the nM-range against several mycobacterial strains and shows no significant cytotoxicity. In contrast, derivative 27, with a glutamic acid at this position, is significantly