Discovery of Potent Human Glutaminyl Cyclase Inhibitors as Anti-Alzheimer’s Agents Based on Rational Design
作者:Van-Hai Hoang、Phuong-Thao Tran、Minghua Cui、Van T. H. Ngo、Jihyae Ann、Jongmi Park、Jiyoun Lee、Kwanghyun Choi、Hanyang Cho、Hee Kim、Hee-Jin Ha、Hyun-Seok Hong、Sun Choi、Young-Ho Kim、Jeewoo Lee
DOI:10.1021/acs.jmedchem.7b00098
日期:2017.3.23
proposed binding mode of the preferred substrate, Aβ3E−42. An in vitro structure–activityrelationshipstudy identified several excellent QC inhibitors demonstrating 5- to 40-fold increases in potency compared to a known QC inhibitor. When tested in mouse models of AD, compound 212 significantly reduced the brain concentrations of pyroform Aβ and total Aβ and restored cognitive functions. This potent Aβ-lowering
Gold-Catalyzed Synthesis of 3-Pyrrolidinones and Nitrones from N-Sulfonyl Hydroxylamines via Oxygen-Transfer Redox and 1,3-Sulfonyl Migration
作者:Hyun-Suk Yeom、Eunsu So、Seunghoon Shin
DOI:10.1002/chem.201002863
日期:2011.2.7
Golden touch: Gold‐catalyzed reaction of N‐sulfonyl hydroxylamines with terminal alkyne led to 3‐pyrrolidinones by means of an oygen‐transfer redox reaction. This protocol constitutes a direct method for forming α‐amino carbonyl compounds. In sharp contrast, those with internal alkynes underwent 1,3‐sulfonyl migration leading to 3‐sulfonyl cyclic nitrones.
of aryl iodides were coupled with aromatic and aliphatic terminal alkynes to give the corresponding 1,2-disubstituted aromatic alkynes in good yields by using only 0.4 mol % of the heterogeneous 10 % Pd/C as the catalyst without a ligand, copper salt, or amine in an aqueous medium.
Easy Copper-, Ligand- and Amine-Free Sonogashira Coupling Reaction Catalyzed by Palladium on Carbon at Low Catalyst Loading and by Exposure to Air
作者:Guolin Zhang
DOI:10.1055/s-2005-863720
日期:——
An easy copper-, ligand and amine-free Sonogashira coupling reaction catalyzed by commercially available palladium on carbon with air at low catalyst loading (0.2 mol% Pd) has been developed. Aryl iodides coupled with aromatic alkynes gave good to excellent yields and with aliphatic alkyne gave moderate to good yields. The reaction system is easy to handle.