Solvent and in situ catalyst preparation impacts upon Noyori reductions of aryl-chloromethyl ketones: application to syntheses of chiral 2-amino-1-aryl-ethanols
摘要:
As part of medicinal chemistry efforts we found it necessary to develop general syntheses of highly enantiomerically enriched 1-aryl-2-chloroethanols and 1-aryl-2-methylaminoethanols. A survey of literature methods suggested that a truly general approach had not yet been reported, encouraging us to undertake the development of such a methodology. This study describes the design, development, and reduction to practice of a general synthesis of chiral 1-aryl-2-chloroethanols and the transformation of these entities to highly enantiomerically enriched 1-aryl-2-methylaminoethanols. Of particular importance were observations of the impact of solvent and the method of catalyst preparation on the yield and enantiomerical excess of chlorohydrins prepared via Noyori transfer hydrogenations of aryl-chloromethyl ketones. (c) 2006 Elsevier Ltd. All rights reserved.
Enantioselective synthesis of heteroaromatic epoxyketones under phase-transfer catalysis using d-glucose- and d-mannose-based crown ethers
摘要:
Heteroaromatic epoxyketones have been synthesized in an asymmetric Darzens condensation of 2-chloroacetylfuran or 2- and 3-chloroacetylthiophene with aromatic aldehydes and in the enantioselective epoxidation of alpha,beta-enones with an N-methylpyrrole unit, in both cases in the presence of D-glucose- 1 or D-mannose-based 2 crown ethers as phase transfer catalysts. The use of D-glucose-based 1 lariat ether as the catalyst gave the best results. The alpha,beta-epoxyketones with a furan or a thiophene moiety were obtained in good enantioselectivities (up to 86% ee) as well as excellent diastereoselectivities (up to 98:2), but the epoxyketones with a pyrrole-ring were formed in the Darzens condensation in low yields and enantioselectivities. The epoxyketones with an N-methylpyrrole moiety isolated from the epoxidation of the corresponding alpha,beta-enones were obtained in significant enantioselectivities (in ee values up to 81%) in the presence of catalyst 1 under mild reaction conditions. (C) 2011 Elsevier Ltd. All rights reserved.
An efficient heterogeneous gold(I)-catalyzed hydration of haloalkynes leading to α-halomethyl ketones
作者:Sifan Hu、Dayi Liu、Chenyu Yan、Mingzhong Cai
DOI:10.1080/00397911.2018.1528616
日期:2018.12.2
Abstract A highly efficient heterogeneous gold(I)-catalyzedhydration of haloalkynes has been developed that proceeds smoothly under mild and neutral conditions and provides a general and practical route for the synthesis of a variety of α-halomethyl ketones with high atom-economy, excellent yield, and recyclability of the gold(I) catalyst. The presented method delivers an attractive alternative to
The present invention provides a compound of formula I
1
or a pharmaceutically acceptable salt thereof wherein R
1
, R
2
and R
3
are as defined in the specification. The compounds are useful for the treatment of viral infections.
SUBSTITUTED PYRAZOLO[4,3-b]PYRIDINES AND THEIR USE AS GLUN2B RECEPTOR MODULATORS
申请人:JANSSEN PHARMACEUTICA NV
公开号:US20200392130A1
公开(公告)日:2020-12-17
Substituted pyrazolo[4,3-b]pyridines as GluN2B receptor ligands. Such compounds may be used in GluN2B receptor modulation and in pharmaceutical compositions and methods for the treatment of disease states, disorders, and conditions mediated by GluN2B receptor activity.
[EN] SUBSTITUTED PYRAZOLO[4,3-b]PYRIDINES AND THEIR USE AS GLUN2B RECEPTOR MODULATORS<br/>[FR] PYRAZOLO[4,3-B]PYRIDINES SUBSTITUÉES ET LEUR UTILISATION EN TANT QUE MODULATEURS DU RÉCEPTEUR GLUN2B
申请人:JANSSEN PHARMACEUTICA NV
公开号:WO2020249791A1
公开(公告)日:2020-12-17
Substituted pyrazolo[4,3-b]pyridines as GluN2B receptor ligands. Such compounds may be used in GluN2B receptor modulation and in pharmaceutical compositions and methods for the treatment of disease states, disorders, and conditions mediated by GluN2B receptor activity.
Thiazolylaminomannosides As Potent Antiadhesives of Type 1 Piliated Escherichia coli Isolated from Crohn’s Disease Patients
作者:Sami Brument、Adeline Sivignon、Tetiana I. Dumych、Nicolas Moreau、Goedele Roos、Yann Guérardel、Thibaut Chalopin、David Deniaud、Rostyslav O. Bilyy、Arlette Darfeuille-Michaud、Julie Bouckaert、Sébastien G. Gouin
DOI:10.1021/jm400723n
日期:2013.7.11
Adherent-invasive Escherichia coli (AIEC) have previously been shown to induce gut inflammation in patients with Crohn’sdisease (CD). We developed a set of mannosides to prevent AIEC attachment to the gut by blocking the FimH bacterial adhesin. The crystal structure of the FimH lectin domain in complex with a lead thiazolylaminomannoside highlighted the preferential position for pharmacomodulations