A compound having activity to inhibit production and/or secretion of β-amyloid protein, and is useful for prevention and/or treatment of various diseases associated with abnormal production and/or secretion of β-amyloid protein, the compound represented by the general formula (I):
[wherein, R
1
represents a C1-C6 alkyl group which may have 1 to 6 halogen atoms as substituent groups, a C2-C6 alkenyl group which may have 1 to 6 halogen atoms as substituent groups, or a C3-C7 cycloalkyl group which may have 1 to 6 halogen atoms as substituent groups; R
2
represents a 6-membered nitrogen-containing monocyclic aromatic heterocyclic group having 1 to 3 substituent groups, or a 9- or 10-membered nitrogen-containing bicyclic heterocyclic group having 1 to 4 substituent groups; Z
1
, Z
2
and Z
3
each independently represent a hydrogen atom, a halogen atom or a cyano group; and n represents 0, 1 or 2], salts thereof, or solvates thereof.
作者:Anthony J. Arduengo、Joshua S. Dolphin、Gabriela Gurău、William J. Marshall、Joseph C. Nelson、Viacheslav A. Petrov、Jason W. Runyon
DOI:10.1002/anie.201301503
日期:2013.5.3
Gripping ligands: A series of fluoroalkoxy‐functionalized imidazol‐2‐ylidene ligands were synthesized by the alkylation of a range of commercially available azoles with hexafluoroisobutylene oxide. The deprotonation of these species with a strong base cleanly generated the free carbenes, which acted as tridentate chelating ligands (see scheme).
Transition State for Alkyl Group Hydrogenation on Pt(111)
作者:Pingping Ye、Andrew J. Gellman
DOI:10.1021/ja075292j
日期:2008.7.1
Substituent effects have been used to probe the characteristics of the transition state to hydrogenation of alkyl groups on the Pt(111) surface. Eight different alkyl and fluoroalkylgroups have been formed on the Pt(111) surface by dissociative adsorption of their respective alkyl and fluoroalkyl iodides. Coadsorption of hydrogen and alkyl groups, followed by heating of the surface, results in hydrogenation