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.
[EN] BICYCLIC METHYLENE AZIRIDINES AND REACTIONS THEREOF<br/>[FR] MÉTHYLÈNE AZIRIDINES BICYCLIQUES ET RÉACTIONS DE CELLES-CI
申请人:SCHOMAKER JENNIFER
公开号:WO2013033245A1
公开(公告)日:2013-03-07
The oxidative functionalization of olefins is a common method for the formation of vicinal carbon-heteroatom bonds. However, oxidative methods to transform allenes into synthetic motifs containing three contiguous carbon-heteroatom bonds are much less developed. The use of bicyclic methylene aziridines (MAs), prepared via intramolecular allene aziridination, as scaffolds for functionalization of all three allene carbons, among other reactions, is described herein.
Heterogeneous Copper‐Catalyzed Cross‐Coupling for Sustainable Synthesis of Chiral Allenes: Application to the Synthesis of Allenic Natural Products
作者:Haibo Wu、Zhiyao Zheng、Kaiheng Zhang、Johan Kajanus、Magnus J. Johansson、Armando Córdova、Jan‐E. Bäckvall
DOI:10.1002/anie.202314512
日期:2023.12.11
cross-coupling of propargylic mesylates and Grignard reagents for the synthesis of diverse chiral allenes catalyzed by a recyclable heterogeneous nanocopper catalyst is reported. The synthetic utility of this sustainable methodology was further demonstrated by itsapplication to the asymmetric total synthesis of 5 valuable allenic natural products.