The tide compound was synthesized from propargyl alcohol and L-glutamic acid via a convergent approach using Sharpless asymmetric epoxidation and asymmetric dihydroxylation for the introduction of chiral centers and Pd-o-catalyzed coupling for construction of the carbon skeleton.
(Carboxyalkyl)benzyl Propargyl Ethers as Selective Inhibitors of Leukocyte-Type 12-Lipoxygenases
摘要:
A series of (carboxyalkyl)benzyl propargyl ethers was synthesized and tested as inhibitors of 12-lipoxygenase (12-LO) from porcine leukocyte cytosol. Optimum activity was displayed by 3-[4-[(2-tridecynyloxy)methyl]phenyl]propanoic acid. Altering the length of the alkyl side chain attached to the acetylenic group reduced activity. Changing the substitution pattern in the (carboxyalkyl)benzyl group from para to meta or ortho also reduced activity. Analogs in which the triple bond was replaced by a double bond or an allene displayed reduced activity, whereas fully saturated analogs were inactive. High concentrations (10 mu M) of the most potent acetylenic (carboxylalkyl)benzyl ethers did not inhibit human platelet 12-LO, human neutrophil 5-LO, rabbit reticulocyte 15-LO, or soybean 15-LO. Thus, this class of compounds represents the first example of isoform specific LO inhibitors.
Metal-mediated alkynediol cycloisomerization: first and second generation formal total syntheses of didemniserinolipid B
作者:Shyamsundar Das、Boddeti Induvadana、C.V. Ramana
DOI:10.1016/j.tet.2012.12.045
日期:2013.2
A formal total synthesis of didemniserinolipid B was developed by employing a regioselective metal-mediated 6-endo-dig alkynol-cycloisomerization reaction. Two routes for the synthesis of key Burke's intermediate have been developed. Our initial approach involved the introduction of a C17-alkynol followed by Pd-mediated cycloisomerization and then coupling with the serinol unit prior to the introduction
Syntheses of two possible diastereoisomers (5S, 18′S, 19′R)- and (5S, 18′R, 19′S)-1 corresponding to the epoxy lactone that has been proposed for epoxyrollin A, a structural representative of biosynthetic precursors of tetrahydrofuran annonaceous acetogenins, are described. The 13C-NMR and tandem mass spectral data of the synthetic samples were not in accord with those recorded for natural epoxyrollin
fluctuation of lipid chains in the deep part of biomembranes, we aimed to develop a new fluorescentprobe based on the well-known trans-parinaric acid (t-PA), but with a tetraene near the end of the C24 chain. The probe, tetracosa-16,18,20,22-tetraenoic acid (TCTEA), synthesized mainly by means of reported strategies, was found to better reflect the behavior of lipids in the deeper interior of bilayers than