One-Pot Synthesis of Au@SiO2 Catalysts: A Click Chemistry Approach
摘要:
Using the copper-catalyzed azidealkyne cycloaddition click reaction, a library of triazole amphiphiles with a variety of functional polar heads and hydrophobic or superhydrophobic tails was synthesized. The amphiphiles were evaluated for their ability to stabilize small Au nanoparticles, and, at the same time, serve as templates for nanocasting porous SiO2. One of the Au@SiO2 materials thus prepared was found to be a highly active catalyst for the Au nanoparticle-catalyzed regioselective hydroamination of alkynes.
Organocatalytic Activity of Cinchona Alkaloids: Which Nitrogen Is More Nucleophilic?
摘要:
The cinchona alkaloids 1a-d react selectively at the quinuclidine ring with benzyl bromide it and at the quinoline ring with benzhydrylium ions (diarylcarbenium ions). The kinetics of these reactions have been determined photometrically or conductimetrically and are compared with analogous reactions of quinuclidine and quinoline derivatives. Quantum chemical calculations [MP2/6-31 + G(2d p)// B3LYP/6-31G(d)] show that the products obtained by attack at the quinuclidine ring (N-sp3) of quinine are thermodynamically more stable when small alkylating agents (primary alkyl) are used, while the products arising from attack at the quinoline ring (N-sp2) are more stable for bulkier electrophiles (Ar2CH). In some cases, rate and equilibrium constants for their reactions with berizhydrylium ions could be determined. These data gave access to the Marcus intrinsic barriers, which are approximately 20 U mol(-1) lower for attack at the N-sp3-center than at the N-sp2-center.
[EN] EX VIVO METHODS FOR PREDICTING AND CONFIRMING IN VIVO METABOLISM OF PHARMACEUTICALLY ACTIVE COMPOUNDS<br/>[FR] MÉTHODES EX VIVO PERMETTANT DE PRÉDIRE ET DE CONFIRMER LE MÉTABOLISME IN VIVO DE COMPOSÉS PHARMACEUTIQUEMENT ACTIFS
申请人:EMPIRIKO CORP
公开号:WO2015089089A1
公开(公告)日:2015-06-18
Methods and compositions for the catalytic oxidation of pharmaceutically active compounds, and more particularly to ex vivo methods for predicting in vivo metabolism of pharmaceutically active compounds, including predicting in vivo interaction between two or more pharmaceutically active compounds.
[EN] PROCESS FOR THE PREPARATION OF GAMMA AMINO ACIDS AND INTERMEDIATES USED IN SAID PROCESS<br/>[FR] PROCÉDÉ DE PRÉPARATION DE ACIDES AMINÉS GAMMA ET INTERMÉDIAIRES UTILISÉS DANS CE PROCÉDÉ
申请人:ROYAL COLLEGE OF SURGEONS IE
公开号:WO2013076225A1
公开(公告)日:2013-05-30
The invention relates to the preparation of gamma amino acids of formula (I) and pharmaceutically acceptable salts, solvates and prodrugs thereof, and to intermediates used for their preparation. (formula I) wherein R1 is selected from an alkyl group, an alkenyl group, an alkynyl group and a cycloalkyl group, each of which may be optionally substituted and * denotes a chiral centre. In particular, the present invention provides an efficient synthesis of (S)-pregabalin which is suitable for carrying out on an industrial scale.
The mechanism of enantiodifferentiation in the hydrogenation of alkenoic acidsover cinchona-modified Pd has been investigated using the tiglic acid → 2-methyl-butanoic acid transformation as test reaction. Application of simple derivatives of cinchonidine, modified at the (C-9)–OH and/or the quinuclidine nitrogen, proved that both functional groups are involved in the enantiodiscriminating step. Addition
Process for producing optically active alpha-substituted cysteine or salt thereof, intermediate therefor, and process for producing the same
申请人:Maruoka Keiji
公开号:US20060069134A1
公开(公告)日:2006-03-30
The present invention provides a simple, practical, and industrially advantageous process for producing an optically active α-substituted cysteine or a salt thereof from inexpensive and readily available materials. The present invention provides a process for producing an optically active α-substituted cysteine or a salt thereof by converting a cysteine derivative into a thiazoline compound and subjecting the resulting thiazoline compound to a stereoselective substituent-introducing reaction catalyzed by an optically active quaternary ammonium salt, in particular, an axially asymmetric quaternary ammonium salt to produce an optically active thiazoline compound and then hydrolyzing the resulting thiazoline compound.
PROCESS FOR THE PREPARATION OF GAMMA AMINO ACIDS AND INTERMEDIATES USED IN SAID PROCESS
申请人:Royal College of Surgeons in Ireland
公开号:US20140336412A1
公开(公告)日:2014-11-13
The invention relates to the preparation of gamma amino acids of formula (I) and pharmaceutically acceptable salts, solvates and prodrugs thereof, and to intermediates used for their preparation. (formula I) wherein R
1
is selected from an alkyl group, an alkenyl group, an alkynyl group and a cycloalkyl group, each of which may be optionally substituted and * denotes a chiral centre. In particular, the present invention provides an efficient synthesis of (S)-pregabalin which is suitable for carrying out on an industrial scale.