A Pd-catalyzed enantioselective C–H carbonylation by desymmetrization was developed with commercially available L-pyroglutamic acid as chiral ligand. Isoquinolinones were successfully obtained with good yields and high enantioselectivities. Mechanistic studies and DFT calculations provided a reasonable reaction pathway.
The organocatalyzed domino Michael–aldol reaction revisited. Synthesis of enantioenriched 3-hydroxycyclohexanone derivatives by reaction of enals with α,α′-diaryl-substituted acetone
作者:James O. Guevara-Pulido、José M. Andrés、Rafael Pedrosa
DOI:10.1039/c5ra11215j
日期:——
The reaction of enals with α,α′-diaryl-substituted acetones (pKa > 18) catalyzed by (S)-1-(2-pyrrolidinylmethyl) pyrrolidine provides direct access to enantioenriched 2,5,6-trisubstituted-3-hydroxy cyclohexanones. The process constitutes a highly stereoselective organocatalytic tandem Michael-intramolecular aldolreaction. It has been demonstrated that the stereoselection is dependent on the reaction
(S)-1-(2-吡咯烷基甲基)吡咯烷催化的烯醛与α,α'-二芳基取代的丙酮(p K a > 18)的反应可直接进入对映体富集的2,5,6-三取代-3-羟基环己酮。该过程构成了高度立体选择性的有机催化串联迈克尔-分子间醇醛缩合反应。已经证明,立体选择取决于反应条件,因为仅顺式非对映异构体能够环化,并且抗非对映异构体参与反迈克尔过程,从而减少对映异构。
Mild base-promoted benzannulation for the construction of polyfunctionalized m-terphenyl derivatives and their application as potent UV-filters
作者:Ramuel John Inductivo Tamargo、Tej Narayan Poudel、Yong Rok Lee
DOI:10.1039/c6ra15193k
日期:——
developed for the construction of polyfunctionalized m-terphenylderivatives in good to excellent yield starting from 3-formyl chromones and 1,3-diaryl-2-propanones under a mild base. This protocol proceeds via domino Knoevenagel/intramolecular Michael addition/ring opening/aromatization. As an extension of this protocol, the synthesized m-terphenylderivatives were evaluated as potent UV-filters.
Sieben Titelverbindungen werden synthetisiert und auf anticoagulante Wirkungen geprüft. Fünf von ihnen waren nach einmaliger oraler Verabreichung an Ratten in der Lage, den Prothrombinspiegel auf weniger als 25 % der Norm abzusenken (12–48 h). Die wirksamste Verbindung 1a tat dies bereits in einer Dosierung von 43 mg/kg. Die Hydrierung der Doppelbindung, die Entfernung der 4‐Hydroxygruppe sowie der
[EN] NOVEL ORGANIC COMPOUND AND ORGANIC LIGHT-EMITTING DEVICE INCLUDING THE SAME<br/>[FR] NOUVEAU COMPOSÉ ORGANIQUE, ET DISPOSITIF ÉLECTROLUMINESCENT ORGANIQUE LE COMPRENANT
申请人:CANON KK
公开号:WO2011136155A1
公开(公告)日:2011-11-03
There is provided a novel organic compound suitably used for a blue light-emitting device and an organic light-emitting device including the novel organic compound. The organic compound is an acephenanthryleno[4,5-k]benzo[e]acephenanthrylene derivative.