observed during a Friedel–Craftsacylation/demethylation cascade. In contrast to this cascade, oxygen-containing acylating reagents do not undergo the demethylation step. By the methodology elaborated here, an access is provided to important intermediates for the total synthesis of seminaphthorhodafluor (SNARF) dyes. High selectivity is observed during a Friedel–Craftsacylation/demethylation cascade
Phenylalkylketone mit halogeniertem Alkyl, die bisher überwiegend durch Fries'sche Verschiebung von Phenolestern dargestellt worden sind, lassen sich einstufig in hoher Ausbeute durch BF3‐Kondensation von Phenolen mit Halogenfettsäuren synthetisieren.
Synthetische Versuche in der Reihe der Antihelmintika
作者:K. W. Rosenmund、D. Schapiro
DOI:10.1002/ardp.19342721017
日期:——
Desazadesmethyldesferrithiocin Analogues as Orally Effective Iron Chelators
作者:Raymond J. Bergeron、Jan Wiegand、William R. Weimar、J. R. Timothy Vinson、Jörg Bussenius、Guo Wei Yao、James S. McManis
DOI:10.1021/jm980340j
日期:1999.1.1
Further structure-activity studies of desferrithiocin analogues are carried out. (S)-desazadesmethyldesferrithiocin, 2-(2-hydroxyphenyl)-Delta(2)-thiazoline-4(S)-carboxylic acid, serves as the principal framework in the current paper. Desazadesmethyldesferrithiocin can be structurally altered with facility, and data are already available on its iron-clearing properties and toxicity parameters. Four different kinds of structural modifications of this framework are undertaken: introduction of hydroxy, carboxy, or methoxy groups on the aromatic ring; alteration of the thiazoline ring; increasing the distance between the ligand donor atoms; and benz-fusion of the aromatic rings. The structural modifications described are shown to have a tremendous imp act on both the iron clearance and toxicity profiles of the desazadesmethyldesferrithiocin molecule. All of the compounds are assessed in a bile-duct-cannulated rodent model to determine iron clearance efficiency. Ligands which demonstrate an efficiency of greater than 2% are carried forward to the iron-overloaded primate for iron-clearing measurements. Ligands with efficiencies greater than 3% in the primate are then evaluated in a formal toxicity study in rodents. On the basis of the results of the present work, 2-(2,4-dihydroxyphenyl)-Delta(2)-thiazoline-4(S)-carboxylic acid is a promising candidate for clinical evaluation.
Dann et al., Justus Liebigs Annalen der Chemie, 1954, vol. 587, p. 16,36