Molecular Simplification of 1,4-Diazabicyclo[4.3.0]nonan-9-ones Gives Piperazine Derivatives That Maintain High Nootropic Activity
摘要:
Several 4-substituted 1-acylpiperazines, obtained by molecular simplification of 4-substituted 1,4-diazabicyclo[4.3.0]nonan-9-ones, have been synthesized and tested in vivo on the mouse passive avoidance test, to evaluate their nootropic activity. The results show that, apparently, an N-acylpiperazine group can mimic the 2-pyrrolidinone ring of 1,4-diazabicyclo[4.3.0]nonan-9-one, as the compounds of the new series maintain high nootropic activity. Moreover molecular simplification produces more clear-cut structure-activity relationships with respect to the parent series. The mechanism of action also appears to be similar in the two series. In fact, although the molecular mechanism remains to be elucidated, the most potent compound of each class (DM232 and 13, DM235) is able to increase acetylcholine release in rat brain. Piperazine derivatives represent a new class of nootropic drugs with an in vivo pharmacological profile very similar to that of piracetam, showing much higher potency with respect to the reference compound. Among the compounds studied, 13 (DM235) shows outstanding potency, being active at a dose of 0.001 mg kg(-1) sc.
meta-Selective C–H Borylation of Benzamides and Pyridines by an Iridium–Lewis Acid Bifunctional Catalyst
作者:Lichen Yang、Nao Uemura、Yoshiaki Nakao
DOI:10.1021/jacs.9b03138
日期:2019.5.15
We report herein the iridium-catalyzed meta-selective C-H borylation of benzamides by using a newly designed 2,2'-bipyridine (bpy) ligand bearing an alkylaluminum biphenoxide moiety. We also demonstrate the iridium-catalyzed C3-selective C-H borylation of pyridine with a 1,10-phenanthroline (Phen) ligand bearing an alkylborane moiety. It is proposed that the Lewisacid-base interaction between the
A compound represented by the formula (I):
or a pharmacologically acceptable salt thereof, wherein Ar
1
represents an imidazolyl group or the like which may be substituted with a C1-6 alkyl group, Ar
2
represents a phenyl group or the like which may be substituted with a C1-6 alkoxy group, X
1
represents a double bond or the like and Het represents a triazolyl group or the like which may be substituted with a C1-6 alkyl group or the like, is effective as a therapeutic or prophylactic agent for a disease caused by Aβ.
[EN] NITROGEN-CONTAINING FUSED HETEROCYCLIC COMPOUNDS AND THEIR USE AS BETA AMYLOID PRODUCTION INHIBITORS<br/>[FR] COMPOSÉS HÉTÉROCYCLIQUES CONDENSÉS CONTENANT DE L'AZOTE ET LEUR UTILISATION EN TANT QU'INHIBITEURS DE PRODUCTION DE LA BÊTA-AMYLOÏDE
申请人:EISAI R&D MAN CO LTD
公开号:WO2010098487A1
公开(公告)日:2010-09-02
A compound represented by the formula [I]: or a pharmacologically acceptable salt or ester thereof, wherein Ring A represents a five-membered aromatic heterocyclic group or the like fused with a non-aromatic ring group, which may be substituted, Ring B represents a phenyl group or the like which may be substituted, X1 represents a single bond or the like, R1 and R2 each represent a C1-6 alkyl group or the like, m represents an integer of 0 to 3, and n represents an integer of 0 to 2, is effective as a therapeutic agent for a disease caused by Aβ.
To provide a novel low-molecular-weight compound that inhibits the production of amyloid-β (Aβ ). A compound represented by the formula [I]: or a pharmacologically acceptable salt or ester thereof, wherein R1 and R2 are the same or different and each represent a substituent selected from the following Substituent Group a1; m represents an integer of 0 to 3; n represents an integer of 0 to 2; X1 represents a single bond or the like; X2 represents a single bond or the like; Ring A represents a five-membered aromatic heterocyclic group or the like which contains two or more nitrogen atoms and may have 1 to 3 substituents selected from the following Substituent Group b1; and Ring B represents a monocyclic or fused cyclic aromatic ring group such as the formula [2] which may have 1 to 3 substituents selected from the following Substituent Group c1, is effective as a therapeutic agent for a disease such as Alzheimer's disease. Substituent Group a1: a C1-6 alkyl group and the like Substituent Group b1: a C1-6 alkyl group and the like Substituent Group c1: an amino group and the like
Nitrogen-Containing Fused Heterocyclic Compounds and Their use as Beta Amyloid Production Inhibitors
申请人:Kitazawa Noritaka
公开号:US20120053171A1
公开(公告)日:2012-03-01
A compound represented by the formula [I]: or a pharmacologically acceptable salt or ester thereof, wherein Ring A represents a five-membered aromatic heterocyclic group or the like fused with a non-aromatic ring group, which may be substituted, Ring B represents a phenyl group or the like which may be substituted, X1 represents a single bond or the like, R1 and R2 each represent a C1-6 alkyl group or the like, m represents an integer of 0 to 3, and n represents an integer of 0 to 2, is effective as a therapeutic agent for a disease caused by Aβ.