Dicationic phenyl-2,2′-bichalcophenes and analogues as antiprotozoal agents
摘要:
A series of phenyl-2,2'-bichalcophene diamidines 1a-h were synthesized from the corresponding dinitriles either via a direct reaction with LiN(TMS)(2), followed by deprotection with ethanolic HCl or through the bis-O-acetoxyamidoxime followed by hydrogenation in acetic acid and EtOH over Pd-C. These diamidines show a wide range of DNA affinities as judged from their Delta T-m values which are remarkably sensitive to replacement of a furan unit with a thiophene one. These differences are explained in terms of the effect of subtle changes in geometry of the diamidines on binding efficacy. Five of the eight compounds were highly active (below 6 nM IC50) in vitro against Trypanosoma brucei rhodesiense (T. b. r.) and four gave IC(50)values less than 7 nM against Plasmodium falciparum (P. f.). Only one of the compounds was as effective as reference compounds in the T. b. r. mouse model for the acute phase of African trypanosomiasis. (C) 2010 Elsevier Ltd. All rights reserved.
A Modular and Catalytic Methodology To Access 2,5-Furan-Based Phenylene/Thiophene Oligomers through a One-Pot Decarboxylative Cross-Coupling from 5-Bromofurfural
作者:Brandon Cigana、Victoria Lapointe、Marek B. Majewski、Pat Forgione
DOI:10.1021/acs.joc.4c00347
日期:2024.6.7
library of 2,5-furan-based phenylene/thiopheneoligomers were synthesized starting from 5-bromofurfural, a derivative of biomass-derived furfural. Varied electronic groups are coupled onto the furan motif, followed by the installation of a phenylene or thiophene central linker through a one-pot Pd-catalyzed decarboxylative cross-coupling reaction. Resulting oligomers containing the furan-phenylene-furan