We have developed a high-efficiency and practical Cu-catalyzed cross-coupling to directly construct versatile α-aryl-esters by utilizing readily available aryl bromides (or chlorides) and malonates. These gram-scale approaches occur with turnovers of up to 1560 and are smoothly conducted by the usage of a low catalyst loading, a new available ligand, and a green solvent. A variety of functional groups
Oxalohydrazide Ligands for Copper‐Catalyzed C−O Coupling Reactions with High Turnover Numbers
作者:Ritwika Ray、John F. Hartwig
DOI:10.1002/anie.202015654
日期:2021.4.6
long‐lived copper catalysts for couplings that form the C−O bonds in biaryl ethers. These Cu‐catalyzed coupling of phenols with aryl bromides occurred with turnovers up to 8000, a value which is nearly two orders of magnitude higher than those of prior couplings to form biaryl ethers and nearly an order of magnitude higher than those of any prior copper‐catalyzed coupling of aryl bromides and chlorides
[EN] SUBSTITUTED PIPERIDINES AS GPR119 MODULATORS FOR THE TREATMENT OF METABOLIC DISORDERS<br/>[FR] PIPÉRIDINES SUBSTITUÉES À TITRE DE MODULATEURS DE GPR119 POUR LE TRAITEMENT DES TROUBLES MÉTABOLIQUES
申请人:BOEHRINGER INGELHEIM INT
公开号:WO2012168315A1
公开(公告)日:2012-12-13
The present invention relates to compounds of general formula (I), wherein R1, Lp, HetAr, Ar, and n are as defined in the application, which have valuable pharmacological properties, and in particular bind to the GPR119 receptor and modulate its activity.
Discovery and Optimization of New Chromium Catalysts for Ethylene Oligomerization and Polymerization Aided by High-Throughput Screening
作者:David J. Jones、Vernon C. Gibson、Simon M. Green、Peter J. Maddox、Andrew J. P. White、David J. Williams
DOI:10.1021/ja0518171
日期:2005.8.1
(p-tolyl)CrCl2(thf)3, identified two new classes of highly active chromium based systems for the oligomerization and polymerization of ethylene, respectively. The polymerization system comprises bidentate ortho-substituted anthracenyl Schiff bases bearing small primary or secondary alkyl imine substituents. The oligomerizationcatalysts are based upon tridentate ortho-triptycenyl-substituted Schiff bases with pyridylmethyl
Compounds of the formula: ##STR1## wherein R.sup.1 and R.sup.2 are alkyl or halo; R.sup.3 is hydrogen or alkyl; Z is halo; and R.sup.4 is alkoxycarbonyl, alkoxy, phenyl, substituted phenyl, a group of the formula ##STR2## wherein R.sup.5 and R.sup.6 are hydrogen, alkyl, alkenyl or alkynyl; a group of the formula ##STR3## wherein R.sup.7 and R.sup.8 are hydrogen and alkyl; a five or six-membered aromatic heterocyclic ring of the formula ##STR4## wherein at least one of V, W, X or Y is an oxygen, sulfur or nitrogen atom, R.sup.9 is alkyl and n is 0, 1, 2 or 3 have herbicidal and plant-growth-regulating activity.