Switchable Synthesis of 7‐ and 14‐Membered Cyclic Peptides Containing <i>N</i>‐Methyl‐ and β‐Amino Acids Utilizing Microflow Technology
作者:Shinichiro Fuse、Ren Okabe
DOI:10.1002/ejoc.202300700
日期:2023.9.14
Switchable synthesis of 7- and 14-membered cyclicpeptides containing non-proteinogenic amino acids was achieved. This is the first report that describes the synthesis of smaller cyclic N-methylated peptides via dimerization-cyclization strategy.
Trichormamides A and B with Antiproliferative Activity from the Cultured Freshwater Cyanobacterium<i>Trichormus</i>sp. UIC 10339
作者:Shangwen Luo、Aleksej Krunic、Hahk-Soo Kang、Wei-Lun Chen、John L. Woodard、James R. Fuchs、Steven M. Swanson、Jimmy Orjala
DOI:10.1021/np5003548
日期:2014.8.22
Two new cyclic lipopeptides, trichormamides A (1) and B (2), were isolated from the cultured freshwater cyanobacterium Trichormus sp. UIC 10339. The strain was obtained from a sample collected in Raven Lake in Northern Wisconsin. The planar structures of trichormamides A (1) and B (2) were determined using a combination of spectroscopic analyses including HRESIMS and 1D and 2D NMR experiments. The absolute configurations of the amino acid residues were assigned by the advanced Marfey's method after acid hydrolysis. Trichormamide A (1) is a cyclic undecapeptide containing two D-amino acid residues (D-Tyr and D-Leu) and one beta-amino acid residue (beta-aminodecanoic acid). Trichormamide B (2) is a cyclic dodecapeptide characterized by the presence of four nonstandard alpha-amino acid residues (homoserine, N-methylisoleucine, and two 3-hydroxyleucines) and one beta-amino acid residue (beta-aminodecanoic acid). Trichormamide B (2) was cytotoxic against MDA-MB-435 and HT-29 cancer cell lines with IC50 values of 0.8 and 1.5 mu M, respectively.