Dynamic Kinetic Asymmetric Allylic Alkylations of Allenes
作者:Barry M. Trost、Daniel R. Fandrick、Diana C. Dinh
DOI:10.1021/ja0543705
日期:2005.10.1
The dynamic kineticasymmetricallylicalkylations of racemic allene acetates has been developed with the DACH−phenyl Trost ligand 2 to give general access to allenes with high enantiomeric excess (84−95%) for both malonate and amine nucleophiles. Further, a most unusual dependence of enantioselectivity on base has been uncovered. The magnitude of the enantioselectivity is heavily dependent on the
(Carboxyalkyl)benzyl Propargyl Ethers as Selective Inhibitors of Leukocyte-Type 12-Lipoxygenases
作者:Gilles Gorins、Lethea Kuhnert、Carl R. Johnson、Lawrence J. Marnett
DOI:10.1021/jm9606047
日期:1996.1.1
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.