Synthesis, antimycobacterial evaluation and pharmacophore modeling of analogues of the natural product formononetin
摘要:
The synthesis and antimycobacterial activity of formononetin analogues is hereby reported. Formononetin and its analogue 11E showed 88% and 95% growth inhibition, respectively, against the H37Rv strain of Mycobacterium tuberculosis. Pharmacophore modeling studies indicated that the presence of a hydroxyl group in formononetin and its analogues, is crucial for maintaining activity. (C) 2015 Elsevier Ltd. All rights reserved.
palladium‐catalyzed [2+2+1] annulation among 3‐iodochromones, benzyl bromides, and norbornene has been developed. This annulation consists of a domino sequence involving Heck coupling/C(sp2)−Hactivation/C(sp3)−Hactivation, affording a variety of complex chromone derivatives bearing five contiguous tertiary carbon centers in up to 94% yield and 99:1 dr. Interestingly, the diastereoselectivity could be
Synthesis of 3-halochromones with simple KX halogen sources enabled by <i>in situ</i> halide oxidation
作者:Yan Lin、Jie-Ping Wan、Yunyun Liu
DOI:10.1039/d0nj00825g
日期:——
On the basis of a designated in situ oxidation tactic, the synthesis of 3-halochromones has been realized for the first time by using simple KX (X = Br, I) salts as halogen sources. Instead of the free radical process, the control experiments indicate that the reported reactions proceed through a halogenium intermediate. Compared to the known synthetic methods relying on molecular halogen, haloid acid
Photoredox Functionalization of 3-Halogenchromones, 3-Formylchromones, and Chromone-3-carboxylic Acids: Routes to 3-Acylchromones
作者:Satenik Mkrtchyan、Viktor O. Iaroshenko
DOI:10.1021/acs.joc.0c00537
日期:2020.6.5
describes a set of new and efficient syntheticroutes toward 3-acyl-substituted chromones ranging from readily available chromone precursors, namely 3-halogenchromones, 3-formylchromones, and chromone-3-carboxylic acids by means of visible-light photoredox catalysis. The operationally simple protocols transform a wide variety of chromone derivatives into challenging 3-acyl-substituted chromones in excellent
Synthesis of Multisubstituted 2-Aminopyrroles/pyridines via Chemoselective Michael Addition/Intramolecular Cyclization Reaction
作者:Xueyu Qi、Haoyue Xiang、Qian He、Chunhao Yang
DOI:10.1021/ol5018855
日期:2014.8.15
A facile and efficient synthetic strategy to construct polysubstituted 2-aminopyrroles/pyridines was developed via chemoselective Michaeladdition/intramolecular cyclization reaction under very mild conditions. It suggested that the chemoselectivity of the process could be controlled by the leaving ability of the halides.
Palladium-catalyzed cascade reactions of 3-iodochromones with aryl iodides and norbornadiene leading to annulated xanthones
作者:Ming Cheng、Jianwei Yan、Feng Hu、Hong Chen、Youhong Hu
DOI:10.1039/c2sc21335d
日期:——
starting materials, takes place via a tandem Heck reaction/double C–H activation/retro-Diels–Alder pathway. The high chemoselectivity of the process is mechanistically unique and it serves as a new approach to achieve regioselective control of C–H activation in Pd/norbornene or norbornadiene systems. Its broad substrate scope, including heteroaryl coupling partners, enables access to diverse annulated xanthones