Synthesis of macrolactam analogues of radicicol and their binding to heat shock protein Hsp90
作者:Bridie L. Dutton、Russell R. A. Kitson、Sarah Parry-Morris、S. Mark Roe、Chrisostomos Prodromou、Christopher J. Moody
DOI:10.1039/c3ob42211a
日期:——
A series of macrolactam analogues of the naturally occurring resorcylic acid lactone radicicol have been synthesised from methyl orsellinate in 7 steps, involving chlorination, protection of the two phenolic groups, and hydrolysis to the benzoic acid. Formation of the dianion and quenching with a Weinreb amide results in acylation of the toluene methylgroup that is followed by amide formation and
一系列天然存在的间苯二甲酸内酯自由基的大环内酰胺类似物已经从甲基或亚磺酸盐中合成,包括氯化、保护两个酚基和水解为苯甲酸等 7 个步骤。形成双阴离子并用 Weinreb 酰胺淬灭导致甲苯甲基酰化,随后形成酰胺和闭环复分解形成大环内酰胺。酚基的最终脱保护得到所需的大环内酰胺,通过等温滴定量热法和蛋白质 X 射线晶体学研究了其与酵母 Hsp90 的 N 末端结构域的结合。
Production of tailored hydroxylated prodiginine showing combinatorial activity with rhamnolipids against plant-parasitic nematodes
作者:D. F. Kossmann、M. Huang、R. Weihmann、X. Xiao、F. Gätgens、T. M. Weber、H. U. C. Brass、N. L. Bitzenhofer、S. Ibrahim、K. Bangert、L. Rehling、C. Mueller、T. Tiso、L. M. Blank、T. Drepper、K.-E. Jaeger、F. M. W. Grundler、J. Pietruszka、A. S. S. Schleker、A. Loeschcke
DOI:10.3389/fmicb.2023.1151882
日期:——
Bacterial secondary metabolites exhibit diverse remarkable bioactivities and are thus the subject of study for different applications. Recently, the individual effectiveness of tripyrrolic prodiginines and rhamnolipids against the plant-parasitic nematode Heterodera schachtii, which causes tremendous losses in crop plants, was described. Notably, rhamnolipid production in engineered Pseudomonas putida strains has already reached industrial implementation. However, the non-natural hydroxyl-decorated prodiginines, which are of particular interest in this study due to a previously described particularly good plant compatibility and low toxicity, are not as readily accessible. In the present study, a new effective hybrid synthetic route was established. This included the engineering of a novel P. putida strain to provide enhanced levels of a bipyrrole precursor and an optimization of mutasynthesis, i.e., the conversion of chemically synthesized and supplemented monopyrroles to tripyrrolic compounds. Subsequent semisynthesis provided the hydroxylated prodiginine. The prodiginines caused reduced infectiousness of H. schachtii for Arabidopsis thaliana plants resulting from impaired motility and stylet thrusting, providing the first insights on the mode of action in this context. Furthermore, the combined application with rhamnolipids was assessed for the first time and found to be more effective against nematode parasitism than the individual compounds. To obtain, for instance, 50% nematode control, it was sufficient to apply 7.8 μM hydroxylated prodiginine together with 0.7 μg/ml (~ 1.1 μM) di-rhamnolipids, which corresponded to ca. ¼ of the individual EC50 values. In summary, a hybrid synthetic route toward a hydroxylated prodiginine was established and its effects and combinatorial activity with rhamnolipids on plant-parasitic nematode H. schachtii are presented, demonstrating potential application as antinematodal agents.
Cross-metathesis of allyl halides with olefins bearing amide and ester groups
作者:Jeong In Yun、Hyoung Rae Kim、Sang Kyum Kim、Deukjoon Kim、Jongkook Lee
DOI:10.1016/j.tet.2011.11.064
日期:2012.1
generation catalyst (III) efficiently promotes these processes with olefins bearing a Weinreb amide group. Lastly, a reinvestigation of the ester group tolerance of the allyl halide CM with unsaturated esters demonstrated that III serves as an efficient catalyst for these reactions.
The compound (Z)-7-cyclohexadecen-1-one is described as a musk odorant. Also described are odorant or aroma mixtures comprising (Z)-7-cyclohexadecen-1-one and one or more other odorants or aromas.