ethyl 4-chlorobutanimidate;hydrochloride

Conditions: temp:20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 9 parts of ethyl 3-amino-4-hydroxybenzoate, 10.2 parts of ethyl 4-chlorobutanimidate hydrochloride and 150 parts of trichloromethane was stirred for 24 hours at 20° C. The separated organic layer was dried, filtered and evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (98:2 by volume) as eluent. The eluent of the desired fraction was evaporated, yielding 10 parts (74.7%) of ethyl 2-(3-chloropropyl)-5-benzoxazolecarboxylate as a residue (interm. 25). The separated organic layer was dried filtered evaporated The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol (98:2 by volume) as eluent The eluent of the desired fraction was evaporated