作者:James B. Summers、Hormoz Mazdiyasni、James H. Holms、James D. Ratajczyk、Richard D. Dyer、George W. Carter
DOI:10.1021/jm00386a022
日期:1987.3
selection of more potent hydroxamic acidinhibitors, a simple hypothesis about the nature of enzyme-inhibitor binding was devised. In this hypothesis, the structures of compounds were matched to a proposed geometry of arachidonic acid when bound to the enzyme. Compounds that match best without extending into disfavored regions were predicted to be the best inhibitors. Three series of hydroxamates selected
Compounds of the formula
where
X is selected from hydrogen, C1 to C22 alkyl or alkenyl, or an electron withdrawing group;
n =0 or 1 and m=0, 1, 2 or 3; but n and m are not 0 simultaneously;
R1 and R2 independently are hydrogen, C1 to C6 alkyl, an electron withdrawing group, or R4;
R3 is H, C1 to C6 alkyl or cycloalkyl, or R4; and
R4 independently at each occurrence, has the formula
where Y is hydrogen or an electron withdrawing group;
and wherein M is a pharmaceutically acceptable cation, are potent inhibitors of lipoxygenase enzymes.
式中X选自氢、C1至C22烷基或烯基或电子僻取基团;n=0或1和m=0、1、2或3;但n和m不同时为0;R1和R2独立地为氢、C1至C6烷基、电子僻取基团或R4; R3 是 H、C1 至 C6 烷基或环烷基,或 R4;以及 R4 在每次出现时独立地具有如下式 Y 是氢或取电子基团;其中 M 是药学上可接受的阳离子,它们是脂氧合酶的强效抑制剂。
Enantioselective iridium-catalyzed hydrogenation of α-arylcinnamic acids and synthesis of (S)-equol
By using iridium catalyst based on chiral spiro phosphine-oxazoline ligands, the hydrogenation of alpha-arylcinnamic acids was accomplished under ambient pressure and low catalyst loading (as low as 0.01 mol %), providing useful 2,3-diarylpropionic acids in high yields with excellent enantioselectivities (up to 99% ee). A catalytic enantioselective synthesis of (S)-equol with the present hydrogenation reaction as a key step was accomplished starting from commercially available starting materials in six steps with 48.4% overall yield. (C) 2012 Elsevier Ltd. All rights reserved.
Maccarone, Emanuele; Mamo, Antonino; Perrini, Giancarlo, Journal of Heterocyclic Chemistry, 1981, vol. 18, p. 395 - 398