Bisaryl cyclobutenes derivatives as cyclooxygenase inhibitors
申请人:Merck Frosst Canada, Inc.
公开号:US05817700A1
公开(公告)日:1998-10-06
The invention encompasses the novel compound of Formula I useful in the treatment of cyclooxygenase-2 mediated diseases. ##STR1## The invention also encompasses certain pharmaceutical compositions for treatment of cyclooxygenase-2 mediated diseases comprising compounds of Formula I.
Experimental Diels-Alder Reactivities of Cycloalkenones and Cyclic Dienes Explained through Transition-State Distortion Energies
作者:Robert S. Paton、Seonah Kim、Audrey G. Ross、Samuel J. Danishefsky、K. N. Houk
DOI:10.1002/anie.201103998
日期:2011.10.24
Quantum chemical calculations are used to investigate the experimentally measured reactivities of cyclicdienes and cycloalkenones in the Diels–Alder reaction. The interaction energies (red) are nearly constant; differences arise in changes in distortionenergies of both dienophile (blue) and diene (green; see picture, Ea=activation energy; values in kcal mol−1).
量子化学计算用于研究Diels-Alder反应中环二烯和环烯酮的反应活性。相互作用能(红色)几乎恒定;亲二烯体(蓝色)和二烯(绿色;见图片,E a =活化能; kcal mol -1的值)的变形能变化会产生差异。
Probing chemical space with alkaloid-inspired libraries
作者:Michael C. McLeod、Gurpreet Singh、James N. Plampin、Digamber Rane、Jenna L. Wang、Victor W. Day、Jeffrey Aubé
DOI:10.1038/nchem.1844
日期:2014.2
Screening of small-moleculelibraries is an important aspect of probe and drug discovery science. Numerous authors have suggested that bioactive natural products are attractive starting points for such libraries because of their structural complexity and sp3-rich character. Here, we describe the construction of a screening library based on representative members of four families of biologically active
Halocycloalkenones as Diels–Alder Dienophiles. Applications to Generating Useful Structural Patterns
作者:Audrey G. Ross、Steven D. Townsend、Samuel J. Danishefsky
DOI:10.1021/jo302230m
日期:2013.1.4
are demonstrated to function as potent dienophiles in inter- and intramolecular Diels–Alder cycloadditions. We have found 2-brominated cycloalkenone dienophiles to be both highly endo selective and significantly more reactive than their nonhalogenated parent compounds. A method for the facile conversion of brominated cyclobutanone DA adducts to synthetically useful cyclopropyl functional handles is described
已证明卤代环烯酮在分子间和分子内 Diels-Alder 环加成反应中作为有效的亲二烯体发挥作用。我们发现 2-溴化环烯酮亲二烯体与它们的非卤化母体化合物相比具有高度的内选择性和显着更高的反应性。描述了一种将溴化环丁酮 DA 加合物轻松转化为合成有用的环丙基功能手柄的方法。
The spatial arrangement of groups within a chiral ligand is essential for its catalytic performance. This work describes convenient synthesis of (R,Sp)-1-(2-(diphenylphosphano)ferrocenyl)-1-(2-diphenylphosphanophenyl)-N,N-dimethylmethanamine, a diastereomer of the well known (R,Rp)-Taniaphos ligand. The compound was prepared from the same homochiral amine as Taniaphos by sequential twofold lithiation