Synthesis of some new 2-oxo-1,4-disubstituted-1,2,5,6-tetrahydro-benzo[h]quinoline-3-carbonitriles and their biological evaluation as cytotoxic and antiviral agents
Enantioselective phospha-Michael reaction of diethyl phosphonate with exocyclic α,β-unsaturated benzocyclic ketones catalyzed by a dinuclear zinc−AzePhenol catalyst
作者:Na Shao、Yong-Yang Luo、Hui-Jie Lu、Yuan-Zhao Hua、Min-Can Wang
DOI:10.1016/j.tet.2018.03.016
日期:2018.4
The dinuclear zinc complexes as high performance catalysts were used to catalyze phospha-Michael reaction of exocyclic α,β-unsaturated benzocyclic ketones under mild conditions, and the desired products possessing 1-indanones or 1-tetralones skeleton were obtained with excellent enantioselectivities of up to 99%/99% ee and yields of up to 99%. The absolute stereochemistry of the major products catalyzed
Determination of dissociation constant of some quinazoline derivatives at different temperatures in DMF–water medium
作者:Shipra Baluja、Kajal Nandha
DOI:10.1016/j.molliq.2014.11.011
日期:2015.1
The dissociation constant and some thermodynamic parameters of synthesized pyrazolo[5,1-b]quinazolines are determined by Calvin Bjerrum pH titration method in mixed organic-water (60:40 v/v) solvent systems. The evaluated data are discussed in terms of the electron donating or electron withdrawing nature of side chain substitutions. The compound containing 4-flouro group is the most acidic whereas
在有机-水(60:40 v / v)混合溶剂体系中,通过Calvin Bjerrum pH滴定法测定了合成的吡唑并[5,1-b]喹唑啉的解离常数和一些热力学参数。根据侧链取代的给电子或吸电子性质讨论了评估的数据。含有4-氟基的化合物是最酸性的,而发现含甲氧基的化合物是最碱性的。为了确定影响和控制三种不同温度下的解离过程的因素,提出并讨论了热力学分析,例如焓(∆ H°),吉布的自由能(∆ G°)和溶液的熵(∆ S°)。本研究。
Asymmetric Transfer Hydrogenation of Arylidene-Substituted Chromanones and Tetralones Catalyzed by Noyori–Ikariya Ru(II) Complexes: One-Pot Reduction of C═C and C═O bonds
作者:Guilherme S. Caleffi、Juliana de O. C. Brum、Angela T. Costa、Jorge L. O. Domingos、Paulo R. R. Costa
DOI:10.1021/acs.joc.0c02981
日期:2021.3.19
3-Arylidenechroman-4-ones and 2-arylidene-1-tetralones are hydrogenated to cis-benzylic alcohols in dr’s and er’s up to 99:1 via a C═C and C═O one-pot reduction in the presence of 2–5 mol % Noyori–Ikariya-type RuII chiral complexes and HCO2Na as a hydrogen source under asymmetric transfer hydrogenation–dynamic kinetic resolution (ATH-DKR) conditions. The oxidation of theses substrates resulted in the
Gerinnungsphysiologische Aktivität von 2-Aryl-2,3,4,5-tetrahydro-1H-benzocyclohepten-1,3-dionen
作者:Klaus Rehse、Thomas Lang、Norbert Rietbrock
DOI:10.1002/ardp.19773101206
日期:——
14 Titelverbindungen wurden synthetisiert. Neun zeigten nach einmaliger oraler Applikation bei Ratten blutgerinnungshemmende Eigenschaften. Fünf verringerten die Gerinnungsfähigkeit des Blutes (Quick‐Zeit) auf weniger als 25% der Norm. Bei 4i (340 mg/kg) wurde dieses Niveau nach 5 h erreicht und 50 h lang aufrechterhalten. Die maximale Verlängerung der Quick‐Zeit wurde hier nach 24 h beobachtet.
Synthesis of Fused Bromofurans via Mg-Mediated Dibromocyclopropanation of Cycloalkanone-Derived Chalcones and Cloke–Wilson Rearrangement
作者:Elumalai Gopi、Irishi N. N. Namboothiri
DOI:10.1021/jo3022988
日期:2013.2.1
dibromocyclopropanation of alkylidenecycloalkanone followed by acidic alumina-mediated regioselective ring expansion of the cyclopropyl ketone. The scope of the reaction was investigated using alkylidenecycloalkanones derived from tetralone, indanone, and benzosuberone to afford 2-aryl-3-bromofurans fused to various benzocycloalkanes. Representative examples of stereoconvergent dibromocyclopropanation and