37901-94-3Relevant articles and documents
PROCESS AND INTERMEDIATES FOR THE PREPARATION OF BENZIMIDAZOLECARBOXYLIC ACIDS
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Page/Page column 11, (2011/01/12)
Substituted benzimidazolecarboxylic acids of formula (I), wherein R1 and R2 independently are hydrogen, C1-6 alkyl or C3-6 cycloalkyl, are prepared in a four-step synthesis starting from N-acyl-4-haloanilines of formula (II), wherein R1 is as defined above, R3 is C1-4 alkyl and X is chlorine or bromine.