3-Mercaptopropanol as a Traceless Linker for Chemical and Enzymatic Synthesis of Oligosaccharides
摘要:
The reducing end of protected carbohydrates can be equipped with a series of aglycones via the photochemical installation of a 3-mercaptoethanol linker. This linker is stable during chemical and enzymatic glycosylation reactions but can be activated readily and efficiently to couple oligosaccharides with different nucleophiles. This approach provides straightforward access to a range of molecules that serve as probes for carbohydrate modifying enzymes.
A nickel-catalyzed, enantioselective, three-component fluoroalkylarylation of unactivated alkenes with aryl halides and perfluoroalkyl iodides has been described. This cross-electrophile coupling protocol utilizes a chiral nickel/BiOx system as well as a pendant chelating group to facilitate the challenging three-component, asymmetric difunctionalization of unactivated alkenes, providing direct access
[EN] ALLOSTERIC BINDING COMPOUNDS<br/>[FR] COMPOSÉS DE LIAISON ALLOSTÉRIQUES
申请人:UNIV AARHUS
公开号:WO2010094289A1
公开(公告)日:2010-08-26
The present invention relates to allosteric binding compounds of formula (I), especially for the treatment of CNS disorders, together with pharmaceutical compositions and methods of treatment including these compounds.
The present invention relates to allosteric binding compounds of formula (I), especially for the treatment of CNS disorders, together with pharmaceutical compositions and methods of treatment including these compounds.
Asymmetric induction reactions. IV. Palladium-catalyzed asymmetric allylations of chiral enamines bearing phosphine groups.
作者:Kunio HIROI、Jun ABE
DOI:10.1248/cpb.39.616
日期:——
The palladium-catalyzed asymmetric allylations of chiral enamines, derived from (S)-2-(diphenylphosphinomethyl)pyrrolidine, produced optically active α-allyl carbonyl compounds in high optical yields. The phosphino group in the chiral enamines presumably serves as a chiral ligand in these palladium-catalyzed reactions. In the transition states of π-allylpalladium complexes coordinated with the intramolecular phosphine group, the anionic counterparts or allylating reagents are considered to play an important role in controlling of the grade of the enantioselectivity.
Finkelstein-rearrangement–elimination reaction of 2-chloro-1-(chloromethyl)ethyl esters induced by NaI. Sodium iodide can be used below equivalence using a reductive agent as sodium thiosulfate. High yields are obtained with most of the diverse esters studied. The method described avoids the use of allyl alcohol as a reagent. 2-Chloro-1-(chloromethyl)ethyl esters are prepared from glycerol, the main by-product