Journal
HELVETICA CHIMICA ACTA
Volume 90, Issue 9, Pages 1765-1780Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/hlca.200790186
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The reaction of aldimines with alpha-(hydroxyimino) ketones of type 10 (1,2-diketone monooximes) was used to prepare 2-unsubstituted imidazole 3-oxides 11 bearing an alkanol chain at N(1) (Scheme 2, Table]). These products were transformed into the corresponding 2H-imidazol-2-ones 13 and 2-imidazole-2-thiones 14 by treatment with AC(2)O and 2,2,4,4-tetramethylcyclobutane-1,3-dithione, respectively (Scheme 3). The three-component reaction of 10, formaldehyde, and an alkane-1,omega-diamine 15 gave the bis[1H-imidazole 3-oxides] 16 (Scheme 4, Table 2). With AC(2)O, 2,2,4,4-tetramethylcyclobutane-1,3-dithione or Raney-Ni, the latter reacted to give the corresponding bis[2H-imidazol-2-ones] 19 and 20, his [2H-imidazol-2-thione] 21, and bis[imidazole] 22, respectively (Schemes 5 and 6). The structures of 11a and 16b were established by X-ray crystallography.
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