由酸性铝官能团 (AlR 2 ) 和碱性膦实体组成的受挫路易斯对能够裂解 THF。R = C 6 F 5的开环反应速率比 R = Mes的开环反应速率高 10 倍。结构和理论研究揭示了二级配位中 C 6 F 5芳烃相互作用的情况——如果它们也存在于过渡态——可以通过反应功能的预取向来帮助开环。然而,在详细的计算研究中发现这些发生并没有显着降低激活障碍。
Telomerisation of Buta-1,3-diene and Methanol: Superiority of Chromanyl-Type Phosphines in the Dow Process for the Industrial Production of 1-MOD
作者:Mathieu J.-L. Tschan、Hélène Launay、Henk Hagen、Jordi Benet-Buchholz、Piet W. N. M. van Leeuwen
DOI:10.1002/chem.201100684
日期:2011.8.1
Butadiene and methanol were telomerised in the presence of palladium catalysts with ligands containing 8‐diphenylphosphinochromane‐like substituents at phosphorus. MonoXantphos and monoSPANphos afforded the most active, stable and selective catalysts known to date under commercially relevant production conditions for 1‐methoxyocta‐2,7‐diene, the precursor to oct‐1‐ene.
Mono- vs. Dinuclear Gold-Catalyzed Intermolecular Hydroamidation
作者:Juan M. Serrano-Becerra、Alexander F. G. Maier、Sandra González-Gallardo、Eric Moos、Christoph Kaub、Maximilian Gaffga、Gereon Niedner-Schatteburg、Peter W. Roesky、Frank Breher、Jan Paradies
DOI:10.1002/ejoc.201402068
日期:2014.7
Mono- and dinuclear gold catalysts were investigated in the intermolecularhydroamidation of olefins. Upon activation of [Ph3PAuCl] and [xantphos(AuCl)2] with various silver salts (AgOTf, Ag[BF4], and Ag[SbF6]), diverging reactivity of the resulting cationic gold complexes was observed. It was found that both the binding ability of the counterion and the solvent have a significant impact on the reactivity
The present invention provide a medicament for treating the diseases induced by production, secretion or deposition of amyloid-β proteins, for example, a compound of the following formula (I) wherein R
1
, R
2a
, R
2b
, R
3a
, R
3b
, R
4a
, R
4b
, ring A, Y and the dotted line are defined in the specification, its pharmaceutically acceptable salt or a solvate thereof.
[EN] SPIROPIPERIDINE COMPOUNDS AND PHARMACEUTICAL USE THEREOF FOR TREATING DIABETES<br/>[FR] COMPOSÉS DE SPIROPIPÉRIDINE ET SON UTILISATION PHARMACEUTIQUE POUR LE TRAITEMENT DU DIABÈTE
申请人:LILLY CO ELI
公开号:WO2011046851A1
公开(公告)日:2011-04-21
A compound of the formula:(I) or a pharmaceutically acceptable salt thereof as well as a pharmaceutical composition, and a method for treating diabetes.