Anti-Selective Glycolate Aldol Additions with an Oxapyrone Boron Enolate
摘要:
GRAPHICSThe boron enolate of pyrone 2 undergoes asymmetric aldol reactions with aldehydes to give protected anti 1,2 diols 3. The pyrone is readily available from trans stilbene using asymmetric dihydroxylation. Yields for the aldol reaction range from 62 to 92% and the selectivities from 6:1 to >20:1 for the anti isomers, Protection and hydrogenolysis of the products can be used to remove the pyrone, giving differentially protected diol intermediates 12 that are amenable to multistep synthesis.
[EN] 1-(6 MEMBERS AZO-HETEROCYCLIC)-PYRROLIN-2-ONE COMPOUNDS AS INHIBITORS OF HEPATITIS C NS5B POLYMERASE, THE PHARMACEUTICAL COMPOSITION THEREOF AND THEIR THERAPEUTIC USE<br/>[FR] COMPOSÉS 1-(AZO-HÉTÉROCYCLE À 6 CHAÎNONS)-PYRROLIN-2-ONE COMME INHIBITEURS DE POLYMÉRASE NS5B D'HÉPATITE C, LEUR COMPOSITION PHARMACEUTIQUE ET LEUR UTILISATION THÉRAPEUTIQUE
申请人:VIVALIS
公开号:WO2011004017A1
公开(公告)日:2011-01-13
The present invention concerns a l-(6 members azo-heterocyclic)-pyrrolin-2-one compound of the following formula I or a salt, solvate, tautomer, isotope, enantiomer, diastereoisomer or racemic mixture thereof: the pharmaceutical composition thereof and their therapeutic use as inhibitors of Hepatitis C NS5B polymerase.
Direct asymmetric hydrogenation of α-keto acids by using the highly efficient chiral spiro iridium catalysts
作者:Pu-Cha Yan、Jian-Hua Xie、Xiang-Dong Zhang、Kang Chen、Yuan-Qiang Li、Qi-Lin Zhou、Da-Qing Che
DOI:10.1039/c4cc07643e
日期:——
A new efficient and highly enantioselective direct asymmetrichydrogenation of alpha-keto acids employing the Ir/SpiroPAP catalyst under mild reaction conditions has been developed. This method might be feasible for the preparation of a series of chiral alpha-hydroxy acids on a large scale.
Iridium Diamine Catalyst for the Asymmetric Transfer Hydrogenation of Ketones
作者:Henar Vázquez-Villa、Stefan Reber、Martin A. Ariger、Erick M. Carreira
DOI:10.1002/anie.201102732
日期:2011.9.12
A simple and very efficient chiral aqua iridium(III) diamine complex leads to excellent enantioselectivities in the asymmetrictransferhydrogenation of various α‐cyano and α‐nitro ketones. The catalyst provides the ortho‐substituted aromatic alcohols with especially high ee values. The diamine ligands can be used directly as chiral ligands; conversion into the corresponding sulfamide is not necessary
Heterocyclic compounds as P2X7 ion channel blockers
申请人:Shum Patrick
公开号:US20050026916A1
公开(公告)日:2005-02-03
The present invention relates to a novel series of 4,5-diphenyl-2-amino-4,5-dihydro-imidazole derivatives of the formula II:
wherein R, R
1
, R
2
, R
3
, R
4
, R
5
, X and Y are as defined herein. This invention also relates to methods of making these compounds. The compounds of this invention are P2X7 ion channel blockers and are therefore useful as pharmaceutical agents, especially in the treatment and/or prevention of a variety of diseases having an inflammatory component, including inflammatory bowel disease, rheumatoid arthritis and disease conditions associated with the central nervous system, such as stroke, Alzheimer's disease, etc.
Asymmetric Pnictogen-Bonding Catalysis: Transfer Hydrogenation by a Chiral Antimony(V) Cation/Anion Pair
作者:Jian Zhang、Jun Wei、Wei-Yi Ding、Shaoyu Li、Shao-Hua Xiang、Bin Tan
DOI:10.1021/jacs.1c02808
日期:2021.5.5
Pnictogen-bonding catalysisbased on σ-hole interactions has recently attracted the attention of synthetic chemists. As a proof-of-concept for asymmetric pnictogen-bonding catalysis, we report herein an enantioselective transfer hydrogenation of benzoxazines catalyzed by a novel chiral antimony cation/anion pair. The chiral pnictogen catalyst library could be rapidly accessed from triarylstibine with