Synthesis of 2-Hydroxymethyl-1<i>H</i>-imidazoles from 1,3-Dihydroimidazole-2-thiones
作者:Erik Pedersen、Yasser Loksha、Ahmed El-Barbary、Mahmoud El-Badawi、Claus Nielsen
DOI:10.1055/s-2003-44370
日期:——
1,3-Dihydroimidazole-2-thiones 1a-d were desulfurized by hydrogen peroxide in either acid or neutral medium to afford 1H-imidazoles 3a-d. Reaction of 3b,d with dimethylsulfamoyl chloride furnished N,N-dimethylsulfamoylimidazoles 5 and 6a,b. Lithiation of 5 and 6a,b followed by formylation and reduction yielded the 2-hydroxymethyl derivatives 7 and 8a,b. 4-Alkyl-5-cyclohexylmethyl-1H-imidazol-2-yl)methanols 9a,b were obtained by hydrolysis of 7 and 8a,b.
1,3-二氢咪唑-2-硫酮 1a-d 在酸性或中性介质中被过氧化氢脱硫,得到 1H-咪唑 3a-d。3b,d与二甲基氨基磺酰氯反应生成N,N-二甲基氨基磺酰基咪唑5和6a,b。将 5 和 6a,b 锂化,然后进行甲酰化和还原反应,可得到 2-羟甲基衍生物 7 和 8a,b。通过水解 7 和 8a,b 得到 4-烷基-5-环己基甲基-1H-咪唑-2-基)甲醇 9a,b。