Structural Evolutions of Salicylaldoximes as Selective Agonists for Estrogen Receptor β
摘要:
The bioisosteric replacement of the phenol ring, a signature functional group of most estrogen receptor (ER) ligands, with a hydrogen-bonded pseudocyclic ring, led to the development of a novel class of nonsteroidal ER-ligands based on a salicylaldoxime template. A series of structural modifications were applied to selected molecules belonging to the monoaryl-salicylaldoxime chemical class in an attempt to improve further their ER beta-selective receptor affinity and agonist properties. Among several modifications, the best results were obtained by the simultaneous introduction of a meta-fluorine atom into the para-hydroxyphenyl substituent present in the 4-position of salicylaldoxime, together with the insertion of a chloro group in the 3-position of the central scaffold. The resulting compound showed the best affinity (K-i = 7.1 nM) and selectivity for ER beta over ER alpha. Moreover, in transcription assays, it proved to be a selective and potent ER beta-full agonist with an EC50 of 4.8 nM.
Improvements and Applications of the Transition Metal-Free Asymmetric Allylic Alkylation using Grignard Reagents and Magnesium Alanates
作者:David Grassi、Alexandre Alexakis
DOI:10.1002/adsc.201500495
日期:2015.10.12
Two new N-heterocyclic carbene (NHC) ligands have been synthesized and employed in the transition metal-free asymmetric allylic alkylation (AAA) mediated by Grignardreagents and magnesium alanates. The employment of these ligands showed high yields and improved regio- and enantioselectivity in the formation of tertiary and quaternary stereocenters. Moreover, the low catalyst loading (up to 0.3 mol%)
A 2-((4-Arylpiperazin-1-yl)methyl)phenol ligated Pd(<scp>ii</scp>) complex: an efficient, versatile catalyst for Suzuki–Miyaura cross-coupling reactions
作者:Srinivas Keesara、Saiprathima Parvathaneni
DOI:10.1039/c5nj03450g
日期:——
N,N,O-Tridentate palladium(ii) complex 4a was found to be an efficient catalyst for the Suzuki cross-couplingreaction of aryl halides (iodo-, bromo- and chloro-), which afforded cross-coupling products in good to excellent yields.
N,N,O-三齿钯 (ii) 配合物 4a 被发现是芳基卤化物(碘-、溴-和氯-)的 Suzuki 交叉偶联反应的有效催化剂,可提供良好的交叉偶联产物优良的产量。
POLYMERIZABLE COMPOUND AND OPTICAL ISOMER
申请人:DIC Corporation
公开号:US20180022716A1
公开(公告)日:2018-01-25
The present invention provides a polymerizable compound having high storage stability without causing crystal precipitation when added to a polymerizable composition. The present invention also provides a polymerizable composition containing the compound. When the filmy polymer produced through polymerization of the polymerizable composition is irradiated with UV light, it hardly discolors or peels from substrate. Further, the present invention provides a polymer produced through polymerization of the polymerizable composition and an optically anisotropic body using the polymer.
Pd-catalyzed protecting-group-free cross-couplings of iodophenols with atom-economic triarylbismuth reagents
作者:Maddali L.N. Rao、Suresh Meka
DOI:10.1016/j.tetlet.2019.151512
日期:2020.2
An efficient protocol for the protecting-group-free synthesis of unsymmetrical hydroxybiaryls via the Pd-catalyzedcross-couplings of unprotected iodophenols with triarylbismuth reagents is described. The presented protocols exhibits good to high yields of hydroxybiaryls.
A method was developed for the preparation of 3-(2,2-dichloroacetyl)-2H-chromen-2-ones and (E)-N′-(2-hydroxybenzylidene)-N,4-dimethylbenzenesulfono hydrazides by reacting salicyl N-tosylhydrazones with ethyl 4,4,4-trichloro-3-oxobutanoate and dimethyl (1-diazo-2-oxopropyl)-phosphonate (Bestmann-Ohira reagent) in presence of RuCl3 ⋅ 3H2O.