Synthesis of the C7–C24 fragment of (−)-Macrolactin F
作者:Roberta A. Oliveira、Juliana M. Oliveira、Luis H.S. Rahmeier、Joao V. Comasseto、Joseph P. Marino、Paulo H. Menezes
DOI:10.1016/j.tetlet.2008.07.113
日期:2008.9
An enantioselective and convergent synthesis of the C7–C24 fragment of Macrolactin F was achieved from four main fragments. A hydrotelluration/transmetalation sequence was used to install the E,Z diene present in the molecule, while a hydrozirconation/transmetalation sequence was used to connect two advanced intermediates.
unsaturated fatty acid moiety has been confirmed in vitro to be synthesized by a type II PKS. Biosynthesis of such a highly reduced polyketide by a type II PKS is worthy of note. However, absolute configuration of ishigamide remained unknown. (R)-Ishigamide was synthesized enantioselectively employing Stille coupling and Wittig reaction between three units, vinyl iodide, stannyldienal, and Wittig salt. Stereochemistry
Cytotoxic activity against three human cancer cell lines and inhibitory effect on CFTR-mediated chloride secretion in human intestinal epithelial (T84) cells of the three synthetic macrolides were evaluated. Mutolide displayed significant cytotoxic activity against HCT116 colon cancer cells (IC50 of ∼12 μM) as well as a potent CTFR inhibitory effect (IC50 of ∼1 μM).
描述了三种 14 元大环内酯天然产物、mutolide、nigrosporolide 和 (4 S ,7 S ,13 S )-4,7-dihydroxy-13-tetradeca-2,5,8-trienolide 的总合成。评估了三种合成大环内酯类对三种人类癌细胞系的细胞毒活性和对人类肠上皮 (T84) 细胞中 CFTR 介导的氯化物分泌的抑制作用。Mutolide 对 HCT116 结肠癌细胞具有显着的细胞毒活性(IC 50约为 12 μM)以及有效的 CTFR 抑制作用(IC 50约为1 μM)。
Synthesis of Z,Z-skipped diene macrolide pheromones for Cryptolestes and Oryzaephilus grain beetles (Coleoptera Cucujidae)
作者:Jocelyn G. Millar、Allan C. Oehlschlager
DOI:10.1021/jo00187a007
日期:1984.6
Annulation of Thioimidates and Vinyl Carbodiimides to Prepare 2-Aminopyrimidines, Competent Nucleophiles for Intramolecular Alkyne Hydroamination. Synthesis of (−)-Crambidine
作者:Nicholas R. Perl、Nathan D. Ide、Sudeep Prajapati、Hahdi H. Perfect、Sergio G. Durón、David Y. Gin
DOI:10.1021/ja910831k
日期:2010.2.17
A convergent synthesis of(-)-crambidine is reported. The sequence Capitalizes on two novel key transformations, including.(I) a [4+2] annulation of thioimidates with vinyl carbodiimides and an alkyne hydroamination employing 2-aminopyrimidine nucleophiles.