Annelated Pyridines as Highly Nucleophilic and Lewis Basic Catalysts for Acylation Reactions
作者:Raman Tandon、Teresa Unzner、Tobias A. Nigst、Nicolas De Rycke、Peter Mayer、Bernd Wendt、Olivier R. P. David、Hendrik Zipse
DOI:10.1002/chem.201204452
日期:2013.5.10
their nucleophilicity and Lewisbasicity. The Lewisbasicity of these bases as quantified through their theoretically calculated methyl‐cation affinities correlate well with the experimentally measured reaction rates for addition to benzhydryl cations. All newly synthesized pyridines show exceptional catalytic activities in benchmark acylationreactions, which correlate only poorly with Lewis basicity
Imidazo-fused oxazolo[4,5-b]pyridine and imidazo-fused thiazolo[4,5-b]pyridine based tricyclic compounds and pharmaceutical compositions comprising same
申请人:Dyckman Alaric
公开号:US20060106051A1
公开(公告)日:2006-05-18
The present invention provides for pyrazolopurine-based tricyclic compounds having the formula (I),
wherein R
1
, R
2
, R
3
, and R
6
are as described herein. The present invention further provides pharmaceutical compositions comprising such compounds, as well as the use of such compounds for treating inflammatory and immune diseases.
Lewis Acidic Boranes, Lewis Bases, and Equilibrium Constants: A Reliable Scaffold for a Quantitative Lewis Acidity/Basicity Scale
作者:Robert J. Mayer、Nathalie Hampel、Armin R. Ofial
DOI:10.1002/chem.202003916
日期:2021.2.24
borane/Lewis base combination through the sum of two descriptors, one for Lewis acidity (LAB) and one for Lewis basicity (LBB). The resulting Lewis acidity/basicity scale is independent of fixed reference acids/bases and valid for various types of trivalent boron‐centered Lewisacids. It is demonstrated that the newly developed Lewis acidity/basicity scale is easily extendable through linear relationships with
基于三芳基硼烷与各种以 O、N、S 和 P 为中心的路易斯碱在二氯甲烷中反应的 90 个实验平衡常数,开发了针对以硼为中心的路易斯酸的定量路易斯酸度/碱度标度。 20℃。使用线性自由能关系 log K B = LA B + LB B进行分析,可以通过两个描述符(一个用于路易斯酸度 ( LA B ))的总和来计算任何类型的硼烷/路易斯碱组合的平衡常数K B。一个用于路易斯碱度(LB B)。所得的路易斯酸度/碱度标度与固定的参考酸/碱无关,并且对于各种类型的三价硼中心路易斯酸有效。事实证明,新开发的路易斯酸度/碱度标度可以通过与量子化学计算或常见的物理有机描述符和已知热力学数据(Δ H )的线性关系轻松扩展。此外,该实验平台可用于硼烷催化反应的合理发展。
1H-imidazo[4,5-d]thieno[3,2-b]pyridine based tricyclic compounds and pharmaceutical compositions comprising same
申请人:Pitts J. William
公开号:US20060178393A1
公开(公告)日:2006-08-10
The present invention provides for thiazolopyridine-based tricyclic compounds having the formula (I),
wherein R
1
, R
2
, R
5
, R
6
and R
7
are as described herein. The present invention further provides pharmaceutical compositions comprising such compounds, as well as the use of such compounds for treating inflammatory and immune diseases.
1,6-DIHYDRO-1,3,5,6-TETRAAZA-AS-INDACENE BASED TRICYCLIC COMPOUNDS AND PHARMACEUTICAL COMPOSITIONS COMPRISING SAME
申请人:Pitts William J.
公开号:US20100210629A1
公开(公告)日:2010-08-19
The present invention provides for tricyclic compounds having the formula (I),
wherein R
1
, R
2
, R
5
, R
6
, R
7
, and R
8
are as described herein. The present invention further provides pharmaceutical compositions comprising such compounds, as well as the use of such compounds for treating inflammatory and immune diseases.