New Total Synthesis of Niphatesine C and Norniphatesine C Based on a Sonogashira Reaction
作者:Jürgen Krauss、Franz Bracher
DOI:10.1002/ardp.200300861
日期:2004.7
The pyridine alkaloid niphatesineC and its analogue norniphatesineC were prepared in a short and efficient way starting from commercially available 3‐iodopyridine and undec‐10‐yn‐1‐ol using a Sonogashirareaction as the key step. The resulting alkylpyridines were tested for antimicrobial activity against several bacteria and fungi. The cytotoxic activities were determined in the MTT assay against
Toward Chemistry-Based Design of the Simplest Metalloenzyme-Like Catalyst That Works Efficiently in Water
作者:Taku Kitanosono、Shū Kobayashi
DOI:10.1002/asia.201403004
日期:2015.1
artificial catalysts. Current strategies to rival enzymatic catalysis require unmodified or minimally modified structures of active sites, gigantic molecular weight, and sometimes the use of harsh conditions such as extremely low temperatures in organic solvents. Herein, we describe a design of small molecules that act as the simplest metalloenzyme‐like catalysts that can function in water, without mimicking
Synthesis and Pharmacological Identification of Neutral Histamine H<sub>1</sub>-Receptor Antagonists
作者:Marinella Govoni、Remko A. Bakker、Ineke van de Wetering、Martine J. Smit、Wiro M. B. P. Menge、Henk Timmerman、Sigurd Elz、Walter Schunack、Rob Leurs
DOI:10.1021/jm030936t
日期:2003.12.1
In the present study we searched for neutral antagonists for the human histamine H-1-receptor (H,R) by screening newly synthesized ligands that are structurally related to H1R agonists for their affinity using radioligand displacement studies and by assessing their functional activity via performing a NF-kappaB driven reporter-gene assay that allows for the detection of both agonistic and inverse agonistic responses. Starting from the endogenous agonist for the H1R, histamine, we synthesized and tested various analogues and ultimately identified several compounds with partial inverse agonistic properties and two neutral Hi-receptor antagonists, namely 2-[2-(4,4diphenylbutyl)-1H-imidazol-4-yl]ethylamine (histabudifen, 18d) (pK(i) = 5.8, alpha = 0.02) and 2-[2-(5,5-diphenylpentyl)-1H-imidazol-4-yl]ethylamine (histapendifen, 18e) (pK(i) = 5.9, alpha = -0.09).