Antiprotozoal and antimicrobial activities of O-alkylated and formylated acylphloroglucinols
摘要:
In the present article, we examined the antileishmanial, antimalarial, antibacterial, and antifungal activities of several newly synthesized O-alkylated phloroglucinol compounds (11-19) which are analogues of the naturally occurring antimalarial compound 1. Analogues 12 and 16 exhibited antileishmanial activity against, Leishmania donovani promastigotes with IC(50)s of 5.3 and 4.2 mu g/mL, respectively. Naturally occurring monomeric formylated acylphloroglucinol compounds, grandinol (2), jensenone (3), and their analogues (29-37), were also synthesized and evaluated for antileishmanial, antimalarial, antibacterial, and antifungal activities. Amongst these, both grandinol and jensenone showed mild to moderate antibacterial, antifungal, and antileishmanial activities. Jensenone (3) was effective against Candida albicans with an IC50 of 5.5 mu g/mL but was ineffective against Cryptococcus neoformans and methicillin-resistant Staphylococcus aureus. Among the analogues, 34 was the most active against C albicans and C. neoformans with IC(50)s of 2.0 and 2.5 mu g/mL, respectively, and was fungicidal toward Candida albicans. (c) 2006 Elsevier Ltd. All rights reserved.
Zinc-catalyzed Williamson ether synthesis in the absence of base
作者:Satya Paul、Monika Gupta
DOI:10.1016/j.tetlet.2004.10.009
日期:2004.11
Zinc powder was found to be a highly efficient catalyst for the synthesis of aromatic ethers using microwave heating in the presence of N,N-dimethylformamide as well as under stirring in an oil-bath using tetrahydrofuran as solvent without any inorganic base. This method can be used for selective mono-, di- or tri-O-alkylations. (C) 2004 Elsevier Ltd. All rights reserved.