通过芳基1,2,4,3-三唑的硝化反应,合成了一系列致密而高能的聚硝基芳基1,2,4-三唑。卤代芳烃与1,2,4-三唑的Cu催化/碱介导的偶联反应提供了N-芳基1,2,4-三唑。这些新的富含硝基的芳基三唑通过分析和光谱方法进行了表征。这些化合物大多数的固态结构是通过X射线衍射分析确定的。它们的热性质通过差示扫描量热法-热重分析法确定。还计算了它们的形成热(HOF)和晶体密度。合成化合物的密度为1.40至1.85 g cm -3。这些新合成的化合物中的一些表现出高正HOF,良好的热稳定性,高密度以及合理的爆速和压力。
Iron complex-catalyzed N-arylation of pyrazoles under aqueous medium
作者:Hang Wai Lee、Albert S.C. Chan、Fuk Yee Kwong
DOI:10.1016/j.tetlet.2009.08.018
日期:2009.10
diamine ligand is a highly effective catalyst for N-arylation of pyrazoles using aryl and heteroaryl iodides. It is notable to show that this complex is tolerable under aqueous medium and particularly the whole reaction utilizes water as the sole solvent without any additional organic co-solvents and surfactants. Attempted study using other nitrogennucleophiles is described. This newly developed system provides
The present invention relates to 4,4a,5,7-tetrahydro-3H-furo[3,4-b]pyridinyl compound inhibitors of beta-site APP-cleaving enzyme having the structure shown in Formula (I)
wherein the radicals are as defined in the specification. The invention is also directed to pharmaceutical compositions comprising such compounds, to processes for preparing such compounds and compositions, and to the use of such compounds and compositions for the prevention and treatment of disorders in which beta-site APP-cleaving enzyme is involved, such as Alzheimer's disease (AD), mild cognitive impairment, preclinical Alzheimer's disease, senility, dementia, dementia with Lewy bodies, Down's syndrome, dementia associated with stroke, dementia associated with Parkinson's disease, and dementia associated with beta-amyloid.