Design, Synthesis, and Biological Evaluations of Aplyronine A–Mycalolide B Hybrid Compound
摘要:
A hybrid compound consisting of aplyronine A and mycalolide B was synthesized, and its biological activities were evaluated. The hybrid compound was found to have somewhat more potent actin-depolymerizing activity than aplyronine A. In contrast, the hybrid compound possessed about 1000-fold less cytotoxicity than aplyronine A. These results indicated that there is no direct correlation between actin-depolymerizing activity and cytotoxicity.
Artificial analogs of aplyronine A (1), a potentantitumor macrolide, were synthesized and structure–activity (cytotoxicity and actin-depolymerizing activity) relationships were investigated; the side-chain in 1 was found to play a key role in both biological activities.
Second-generation totalsynthesis of aplyronine A, a potentantitumormarine macrolide, was achieved using Ni/Cr-mediated coupling reactions as key steps. The overall yield of the second-generation synthetic pathway of aplyronine A was 1.4%, obtained in 38 steps based on the longest linear sequence. Compared to our first-generation synthetic pathway of aplyronine A, the second-generation synthesis greatly improved
trisoxazole marine macrolides mycalolides A and B is described. This synthesis involves the convergent assembly of highly functionalized C1–C19 trisoxazole and C20–C35 side‐chain segments through the use of olefinmetathesis and esterification as well as Julia–Kocienski olefination and enamide formation as key steps.
Synthesis and application of<i>N<sup>α</sup></i>-Fmoc-<i>N<sup>π</sup></i>-4-methoxybenzyloxymethylhistidine in solid phase peptide synthesis
作者:Hajime Hibino、Yasuyoshi Miki、Yuji Nishiuchi
DOI:10.1002/psc.2464
日期:2012.12
incorporation of the His residue even in the case of MW‐assisted SPPS performed at a high temperature. In particular, the MBom group proved to be a suitable protectinggroup for the convergent synthesis because it remains attached to the imidazole ring during detachment of the protected His‐containing peptide segments from acid‐sensitive linkers by treatment with a weak acid such as 1% trifluoroacetic acid