Palladium-Catalyzed Additions of Terminal Alkynes to Acceptor Alkynes
作者:Barry M. Trost、Mark T. Sorum、Chuen Chan、Gerd Rühter
DOI:10.1021/ja9624937
日期:1997.1.1
The development of addition reactions wherein the product is the simple sum of the reactants plus anything else (only needed catalytically) constitutes an important goal for enhanced synthetic efficiency. The C−H bond of terminalalkynes (the donor alkynes) can be added to either terminalalkynes (self-coupling) or activated internal alkynes (cross-coupling) (the acceptor alkynes) in the presence of
A light-emitting element with high emission efficiency. The light-emitting element includes a pair of electrodes and an EL layer between the pair of electrodes. In the light-emitting element, the EL layer contains at least a light-emitting material, the light-emitting material is a 1,6-bis(diphenylamino)pyrene derivative, and a structural change between an excited state and a ground state in the 1,6-bis(diphenylamino)pyrene derivative is smaller than that in a 1,6-bis(diphenylamino)pyrene derivative in which hydrogen is bonded to ortho positions of two phenyl groups of each of two diphenylamino groups.
Catalytic Phosphorus(V)-Mediated Nucleophilic Substitution Reactions: Development of a Catalytic Appel Reaction
作者:Ross M. Denton、Jie An、Beatrice Adeniran、Alexander J. Blake、William Lewis、Andrew M. Poulton
DOI:10.1021/jo201085r
日期:2011.8.19
from stoichiometric waste products into catalysts and a new concept for catalytic phosphorus-based activation and nucleophilicsubstitution of alcohols has been validated. The present study has focused on a full exploration of the scope and limitations of phosphine oxide catalyzed chlorination reactions as well as the development of the analogous bromination reactions. Further mechanistic studies, including
Catalytic Asymmetric Cyano-Ethoxycarbonylation Reaction of Aldehydes using a YLi<sub>3</sub>Tris(binaphthoxide) (YLB) Complex: Mechanism and Roles of Achiral Additives
Full details of a catalytic asymmetric cyano-ethoxycarbonylation reactionpromoted by a heterobimetallicYLi3tris(binaphthoxide) complex (YLB 1), especially mechanisticstudies, are described. In the cyanation reaction of aldehydes with ethyl cyanoformate, three achiral additives, H2O, tris(2,6-dimethoxyphenyl)phosphine oxide (3a), and BuLi, were required to achieve high reactivity and enantioselectivity
The present invention relates to compounds of formula (I)
1
The compounds are useful in the treatment and/or prevention of conditions mediated by nuclear receptors, in particular the Peroxisome Proliferator-Activated Receptors (PPAR).