The rearrangement of tosylated flavones to 1′-(alkylamino)aurones with primary amines
摘要:
A rearrangement of 3-tosylflavone to the corresponding 1'-(alkylamino)aurone proceeds under mild conditions in the presence of primary amines in high yields. The reaction is applicable to different substituted 3-tosylflavones and alkyl amines and the respective aurones were isolated as a mixture of E/Z isomers. Further conversion of 1'-(methylamino)aurone to the corresponding thionated compound was performed by reaction with Lawesson's reagent and only the E isomer was obtained. This observation can be explained by the weaker exocyclic double bond, which facilitates rotation and the formation of the thermodynamically preferred E form. The characterization, preliminary biological investigations of the synthesized compounds and lipophilicity studies are discussed. (C) 2015 Elsevier Ltd. All rights reserved.
Chroman‐4‐one‐Based Amino Bidentate Ligand: An Efficient Ligand for Suzuki‐Miyaura and Mizoroki‐Heck Coupling Reactions in Aqueous Medium
作者:Danish Khan、Iram Parveen
DOI:10.1002/ejoc.202100866
日期:2021.9.21
A new family of phosphine-free, air and moisture stable ligand are developed for coupling reaction. The synthesised ligandefficiently catalyzed the coupling reaction with PdCl2. The main advantage of the developed protocol is the tolerance of wide substrate including sterically hindered substrates, low ligand loading and short reaction time with good-to-excellent yield.