A new [4 + 2] type cyclocondensation was developed to prepare 3,5- and poly-substituted phenols using aryl ketoesters and ynones as the starting materials; Various substrates, such as aryl-, heteroaryl ketoesters and aryl-, vinyl-, alkyl substituted ynones, were employed. In addition, extending the substrate scope to benzoyl acetone provided 3,4,5-trisubstituted phenols.
New Syntheses of Alkylaryl and Diaryl Disubstituted Phenols and Ethyl Salicylates The sodium acetate- or triethylamine-catalyzed reaction of the chalcones and chalcone analogues 1a-n with 1-(2-oxopropyl)pyridinium chloride (2) or 1-(3-ethoxycarbonyl-2-oxopropyl)pyridinium bromide (3) gives the 3,5-disubstituted phenols (6a-g) or the 4,6-disubstituted ethyl 2-hydroxybenzoates (7a-1) in yields from 25 to 83α. Both reactions fail for chalcones with one o-substituted aryl substituent or for p,p′-dinitro-substituted diarylchalcones.
Substituted Terphenyl Compounds as the First Class of Low Molecular Weight Allosteric Inhibitors of the Luteinizing Hormone Receptor
作者:Laura H. Heitman、Rajeshwar Narlawar、Henk de Vries、Milou N. Willemsen、Dieter Wolfram、Johannes Brussee、Adriaan P. IJzerman
DOI:10.1021/jm801561h
日期:2009.4.9
fertility and certain cancers. The endogenous ligands human chorionic gonadotropin (hCG) and LH bind to the large N terminal domain of the receptor. We recently reported on the first radiolabeled lowmolecularweight (LMW) agonist for this receptor, [3H]Org 43553, which was now used to screen for new LMW ligands. We identified a terphenyl derivative that inhibited [3H]Org 43553 binding to the receptor, which
Polymer-supported preparation of substituted phenols: A new example of simultaneous cyclization-cleavage reaction on solid phase
作者:Alan R Katritzky、Sergei A Belyakov、Yunfeng Fang、John S Kiely
DOI:10.1016/s0040-4039(98)01771-7
日期:1998.10
A series of variously substituted phenols was synthesized in high yields using the “cyclization-cleavage” approach. Base-catalyzed reactions between α,β-unsaturated ketones and polymer-bound acetonyl groups result in a tandem Michael addition/annulation reaction followed by elimination and rearrangement into phenols. Since all intermediates are on the resin until the last stage, the final reaction