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Synthesis 2003(18): 2844-2850
DOI: 10.1055/s-2003-42442
DOI: 10.1055/s-2003-42442
PAPER
© Georg Thieme Verlag Stuttgart · New York
Formation of Two 4-Imidazolylmethylphosphonium Salts and their Synthetic Studies Toward Histamine H3-Ligands
Weitere Informationen
Received
25 August 2003
Publikationsdatum:
21. Oktober 2003 (online)
Publikationsverlauf
Publikationsdatum:
21. Oktober 2003 (online)

Abstract
A simple and convenient preparation of {[1H-imidazol-4(5)-yl]methyl}triphenylphosphonium chloride (5) is described. The phosphonium salt 5 could be applied to the synthesis of 1-[1H-imidazol-4(5)-yl]-5-arylpentan- or 6-arylhexan-3-ones 4a-d exhibiting histamine H3-antagonistic activities via a 1,3-diazafulvene intermediate 6 generated from 5. Further, two-methylene-enlongated homolog 3 of imifuramine was efficiently synthesized, starting from Wittig olefination of aldehyde 24 using [(1-tritylimidazol-4-yl)methyl]triphenylphosphonium chloride 7.
Key words
imidazole - histamine H3-ligand - phosphonium salts - diazafulvene - Wittig olefination
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References
Dess-Martin periodinane was purchased from Lancaster or Aldrich.