Method D.--IVone of the preceding methods was succew ful in attempted preparations of N- (2-benzimidazolyl)-l, 4-benzodioxan-2-carboxamide (compd. 26), which was therefore synthesized as follows: To a solution of 5.32 g. of 2-aminobenzimidazole in 80 ml. of dry pyridine was added with stirring and cooling in ice 8 g. of the acid chloride IV in small portions over one hour. The ice-bath was removed and stirring continued at room ...
