Copper(<scp>i</scp>) catalyzed asymmetric 1,2-addition of Grignard reagents to α-methyl substituted α,β-unsaturated ketones
作者:Ashoka V. R. Madduri、Adriaan J. Minnaard、Syuzanna R. Harutyunyan
DOI:10.1039/c1cc16725a
日期:——
The first catalytic enantioselective 1,2-addition of Grignard reagents to ketones is presented. This additive-free copper(I) catalyzed 1,2-addition provides chiral allylic tertiary alcohols with an er of up to 98:2 and excellent yields due to the complete shift of overwhelming 1,4-selectivity of copper(I)-catalysts towards 1,2-selectivity in the addition reaction to enones.
Compounds of formula (I) or a pharmaceutically acceptable derivative thereof:
wherein A, B, D, Z, R
1
, R
2a
, R
2b
, and R
x
are as defined in the specification, a process for the preparation of such compounds, pharmaceutical compositions comprising such compounds and the use of such compounds in medicine.
申请人:National University Corporation
Hokkaido University
公开号:EP2543712A1
公开(公告)日:2013-01-09
The present invention discloses a supercooling promoting agent comprising a tannin for producing practical water which does not freeze. As the tannin, a hydrolyzable tannin such as 2, 3, 6-tri-O-galloyl-α, β-D-hamamelose, 1, 2, 6-tri-O-galloyl-β-D-glucose, and a vitrification liquid, each of which contains the supercooling promoting agent are useful as a solution or the like for storig a biological material at low temperature,
[EN] CHEMICAL SYNTHESIS OF LOW MOLECULAR WEIGHT POLYGLUCOSAMINES AND POLYGALACTOSAMINES<br/>[FR] SYNTHESE CHIMIQUE DE POLYGLUCOSAMINES ET DE POLYGALACTOSAMINES DE FAIBLE MASSE MOLECULAIRE
申请人:DU PONT
公开号:WO2007001283A2
公开(公告)日:2007-01-04
[EN] A process for the synthesis of beta linked low molecular weight polymers of galactosamine and glucosamine has been developed. Through the use of high amounts of activating agents, efficient coupling of stable monomers is achieved. Using this process, chain extension is through the addition of single monomers, providing populations of single chain length polyhexosamines. [FR] L'invention concerne un procédé de synthèse de polymères de faible masse moléculaire à liaison bêta de galactosamine et de glucosamine. Un couplage efficace de monomères stables est obtenu au moyen de taux élevés d'agents activants. Dans ce procédé, l'allongement de chaîne se fait par l'addition de monomères uniques, de façon à produire des populations de polyhexosamines à une seule longueur de chaîne.
[EN] ACTINIC-RAY- OR RADIATION-SENSITIVE RESIN COMPOSITION AND METHOD OF FORMING A PATTERN USING THE SAME<br/>[FR] COMPOSITION DE RÉSINE SENSIBLE AU RAYONNEMENT OU À DES RAYONS ACTINIQUES ET PROCÉDÉ DE FORMATION D'UN MOTIF AU MOYEN D'UNE TELLE COMPOSITION
申请人:FUJIFILM CORP
公开号:WO2011034213A1
公开(公告)日:2011-03-24
According to one embodiment, an actinic-ray- or radiation-sensitive resin composition includes a resin containing a repeating unit (A) containing both a structural moiety (S1) that is decomposed by an action of an acid to thereby generate an alkali-soluble group and a structural moiety (S2) that is decomposed by an action of an alkali developer to thereby increase its rate of dissolution into the alkali developer, and a compound that generates an acid when exposed to actinic rays or radiation.