4238-72-6Relevant academic research and scientific papers
6,11-dihydro-5H-benzo[d]imidazo[1,2-a]azepines derivatives as histamine H4 receptor ligands
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Page/Page column 77; 78, (2016/03/06)
The present patent application concerns new ligands of the H4-receptor, their process of preparation and their therapeutic use.
Synthesis and histamine H3 receptor activity of 4-(n-alkyl)-1H-imidazoles and 4-(omega-phenylalkyl)-1H-imidazoles.
De Esch,Gaffar,Menge,Timmerman
, p. 3003 - 3009 (2007/10/03)
The influence of lipophilic moieties attached to a 4-1H-imidazole ring on the histamine H3 receptor activity was systematically investigated. Series of 4-(n-alkyl)-1H-imidazoles and 4-(omega-phenylalkyl)-1H-imidazoles were prepared, with an alkyl chain varying from 2-9 methylene groups and from 1-9 methylene groups, respectively. The compounds were tested for their activity on the H3 receptor under in vitro conditions. For the 4-(n-alkyl)-1H-imidazoles the activity is proportional to chain length, ranging from a pA2 value of 6.3 +/- 0.2 for 4-(n-propyl)-1H-imidazole to a pA2 value of 7.2 +/- 0.1 for 4-(n-decyl)-1H-imidazole. For the series 4-(omega-phenylalkyl)-4H-imidazoles an optimum in H3 activity was found for the pentylene spacer: 4-(omega-phenylpentyl)-1H-imidazole has a pA2 value of 7.8 +/- 0.1.
HIGH-YIELDING SYNTHESES OF 4(5)-SUBSTITUTED IMIDAZOLES VIA ORGANOLITHIUM INTERMEDIATES. THE UTILITY OF SULPHONAMIDE N-PROTECTION AND SILICON-CONTAINING BLOCKING GROUPS
Carpenter, Andrew J.,Chadwick, Derek J.
, p. 2351 - 2358 (2007/10/02)
N-protection of imidazole as its N,N-dimethyl-sulphonamido derivative, and blocking of the 2-position with the triethylsilyl group permits regioselective 5-metallation with sec-butyl-lithium.The resulting organolithium intermediates react with a range of electrophiles and the products are easily deprotected to give the 4(5)-substituted NH-free imidazoles in good to excellent yields.Isolation of the silicon-blocked intermediate is unnecessary and, indeed, is disadvantageous to final yields, making the procedure attractively economical of time.
