Keynote article. Nickel catalysed coupling of allylamines and boronic acids
作者:Barry M. Trost、Michel D. Spagnol
DOI:10.1039/p19950002083
日期:——
vinyl derivatives, E-isomers couple more efficiently than Z-isomers and both fully retain the geometrical integrity. Methylations preferably employ the boronic esters like 2-methyl-1,3,2-benzodioxaborole or 2-methyl-1,3,2-dioxaborolane rather than methylboronic acid. The stereochemistry of the reaction involves a net inversion with respect to the allylamine. The regioselectivity is a function of ligand
Palladium-Catalyzed Cross-Coupling Reactions of in Situ Generated Allylindium Reagents with Aryl Halides
作者:Phil Ho Lee、Sun-young Sung、Kooyeon Lee
DOI:10.1021/ol016532h
日期:2001.10.1
[reaction: see text] In situ generated allylindium reagents from the reaction of 1 equiv of indium with 1.5 equiv of allyl halides could be effective cross-coupling partners in palladium-catalyzedcross-couplingreactions to arylhalides. The best results were obtained with 2% Pd(2)dba(3)CHCl(3) and 16% Ph(3)P in the presence of 3 equiv of LiCl in DMF at 100 degrees C.
Kynurenic acid derivatives useful in the treatment of neurodegenerative
申请人:Merck Sharp & Dohme Limited
公开号:US05270309A1
公开(公告)日:1993-12-14
4-Oxo-1,4-dihydroquinoline compounds having a 2-acidic group or a group convertible thereto in vivo, and their pharmaceutically acceptable salts, are potent specific antagonists of N-methyl-D-aspartate (NMDA) receptors and are therefore useful in the treatment of neurodegenerative disorders. 4-Oxo-1,4-dihydroquinoline compounds having a 2-acidic group or a group convertible thereto in vivo, other than carboxy or C.sub.1-6 alkoxycarbonyl, are novel compounds, as also are compounds of formula II ##STR1## wherein R.sup.2 represents carboxy or a group convertible thereto in vivo, R.sup.6 is hydrogen and R.sup.5 and R.sup.7 represent C.sub.1-6 alkyl or halogen, provided that R.sup.5 and R.sup.7 are not simultaneously chlorine or simultaneously bromine; a process for preparing the novel compounds is described, as also are pharmaceutical compositions containing the novel compounds.