Ring-Opening/Recyclization Cascades of Monoactivated Cyclopropanes
作者:Uttam K. Mishra、Kaushalendra Patel、S. S. V. Ramasastry
DOI:10.1021/acs.orglett.0c01056
日期:2020.5.15
A variety of cyclopropyl aryl ketones undergo uncatalyzed cascade ring-opening/recyclization reactions to generate indenones and fluorenones. In addition, a new strategy to access 3-hydroxyindanones possessing two contiguous stereogenic centers, one of them being an all-carbonquaternarycenter, was also established. During the course of the investigation, pronounced solvent, temperature, and substituent
The Buchwald–Hartwig coupling/Michael addition sequence has been successfully applied to the synthesis of functionalized 1,2-disubstituted 4-quinolones using Pd(OAc)2 as a catalyst and PPh3 as a ligand. Under these conditions, the intermediate products first formed from chalcones and primaryamines underwent catalytic dehydrogenation to yield the 1,2-disubstituted 4-quinolones.
Palladium Nanoparticles‐Catalyzed Synthesis of Indanone Derivatives via Intramolecular Reductive Heck Reaction
作者:Naziya Parveen、Govindasamy Sekar
DOI:10.1002/adsc.201900752
日期:2019.10.8
An efficient protocol for the straightforward, single‐step synthesis of 3‐aryl‐1‐indanones from 2′‐iodochalcone via reductive Heckreaction using phosphine free, stable and reusable binaphthyl stabilized palladium nanoparticle (Pd‐BNP) as a catalyst has been described. An immense array of substrate scope with electron‐rich and deficient 2′‐iodochalcones have been synthesized. Further derivatization
[EN] COMPOSITION FOR TREATING DIABETES AND METABOLIC DISEASES AND A PREPARATION METHOD THEREOF<br/>[FR] COMPOSITION POUR LE TRAITEMENT DU DIABÈTE ET DE MALADIES MÉTABOLIQUES, ET SON PROCÉDÉ DE PRÉPARATION
申请人:UNIV KAOHSIUNG MEDICAL
公开号:WO2013022951A1
公开(公告)日:2013-02-14
Disclosed is a chalcone composition for treating diabetes and metabolic syndromes. In particular, the chalcone compound bound with 2-halogen in ring A significantly decreases the blood glucose level in the in vitro anti-diabetic effect experiment. In the in vivo animal model, the leading chalcone compound can prevent the progression of diabetes and control the blood glucose level, and there is no significant difference in the gains in body weight. Throughout the seven-week administration, there are no hepatic or renal toxicity observed.
Copper-Catalyzed One-Pot Synthesis of 2-Arylthiochromenones: An in Situ Recycle of Waste Byproduct as Useful Reagent
作者:Subramani Sangeetha、Govindasamy Sekar
DOI:10.1021/acs.orglett.8b03508
日期:2019.1.4
Copper-catalyzed one-pot synthesis of various 2-arylthiochromenones is developed using xanthate as an odorless sulfur source from easily acquirable 2′-halochalcones. This methodology demonstrates that the cross-coupled product thiochromanone synthesized from 2′-halochalcones (upstream reaction) is oxidized to thiochromenone (downstream reaction) in the same pot using waste byproduct (KI) of the first