It was well known that mercapto was an important nucleophilic group in organic chemistry. And the compounds containing mercapto were used widely as the nucleophilic reagents in organic synthesis. Hence, 1-methyl-2- mercaptobenz imidazole 5a,2-mercapto benzothiazole 5b, and 2-mercaptobenzo xazole 5c were chosen as the starting materials to examine whether mercapto could be used as the reaction group to form correspondi ng products 6 (Scheme 2). Unfortunately, none of 5a, 5b,or 5c could react to give the product 6.