A facile synthesis of 5(6)‐(chloromethyl)benzimidazoles: Replacement of a sulfonic acid functionality by chlorine
作者:Béla Pete、Bálint Szokol、László Toőke
DOI:10.1002/jhet.5570450208
日期:2008.3
5(6)-(chloromethyl)benzimidazoles, were prepared by the facile elimination of sulfur dioxide under the influence of thionyl chloride from benzimidazole-5(6)-methane-sulfonic acids easily obtained from (3,4-diaminophenyl)methanesulfonic acid with formic-, or trifluoroacetic acid. Both reaction steps involved only acidic conditions, thus the synthesis of polysubstituted 5(6)-(chloromethyl)benzimidazoles