Asymmetric Hydroarylation of Enones via Nickel-Catalyzed 5-<i>Endo-Trig</i> Cyclization
作者:Xurong Qin、Marcus Wen Yao Lee、Jianrong Steve Zhou
DOI:10.1021/acs.orglett.9b02130
日期:2019.8.2
A nickel-catalyzed reductivecyclization of enones affords a wide array of indanones in high enantiomeric induction. The reaction is featured with an unprecedented broad scope of substrates. The versatility of the new method is demonstrated in several short stereoselective syntheses of medically valuable (R)-tolterodine, parent and deuterated (+)-indatraline, and an antitumor natural product, (+)-multisianthol
The present invention relates to aromatic compounds suitable for preparation of asymmetric polydentate ligands. The present invention further describes a process for preparing asymmetric polydentate ligands and metal complexes comprising these ligands which are suitable for use as emitters in organic electroluminescent devices.
An efficientdomino process for the synthesis of thioflavanones has been described using a copper catalyst without addition of any external ligand. A variety of thioflavanones have been synthesized from easily accessible 2′-iodochalcones or 2′-bromochalcones in excellent yield through in situ incorporation of sulfur using xanthate as an odorless sulfur source. This domino process proceeds through Cu-catalyzed
Versatile Synthesis of 3-Arylindan-1-ones by Palladium-Catalyzed Intramolecular Reductive Cyclization of Bromochalcones
作者:Ask Püschl、Hans Christian Rudbeck、André Faldt、Allesia Confante、Jan Kehler
DOI:10.1055/s-2004-834929
日期:——
We have developed a novel and versatile synthesis of racemic 3-arylindan-1-ones by palladium-catalyzed intramolecular reductivecyclization of bromochalcones. This method is especially attractive because it avoids strong acidic conditions and consequently a larger number of sensitive functional groups are accepted during synthesis compared with existing methods.
Palladium, a versatile catalyst, is controllable via reaction conditions tuning. This research highlights the palladium catalyst‘s application in synthesizing phenanthrenols through a sequential cascade of Suzuki/Heckreactions between chalcone and 2-bromophenyl-boronic acid, followed by Michael addition. The order of reactions can be adjusted by manipulating solvent types and reagent concentrations