Parallel solid-phase synthesis of disubstituted 3-(1H-benzo[d]imidazol-2-yl)imidazolidine-2,4-diones and 3-(1H-benzo[d]imidazol-2-yl)-2-thioxoimidazolidin-4-ones
作者:Sureshbabu Dadiboyena、Adel Nefzi
DOI:10.1016/j.tetlet.2011.10.064
日期:2011.12
A multistep approach to construct novel 3-(1H-benzoldlimidazol-2-yl)imidazolidine-2,4-diones and 3-(1H-benzordlimidazol-2-yl)-2-thioxoimidazolidin-4-ones from commercially available amino acids, amines, and carboxylic acids is described. Coupling of Fmoc-amino acid to resin-bound aminobenzimidazole provided following Fmoc elimination free amine. Treatment of the free amine with 1,1'-carbonyldiimidazole or 1,1'-thiocarbonyldiimidazole furnished the corresponding hydantoins and thiohydantoins via intramolecular cyclization. The desired aminobenzimidazole tethered hydantoins or thiohydantoins were isolated in good yields. (C) 2011 Elsevier Ltd. All rights reserved.