Carbon Tetrachloride → 3-methyl-1-(2-methylphenyl)-5-phenyl-1H-1,2,4-triazole

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Next, into a 300-mL recovery flask were put 8.68 g of o-tolylhydrazine hydrochloride, 100 mL of carbon tetrachloride, and 35 mL of triethylamine (Et3N), and the mixture was stirred at room temperature for 1 hour. After a predetermined time elapsed, 8.72 g of N-(1-ethoxyethylidene)benzamide obtained in Step 1 above was added to this mixture, and the mixture was stirred at room temperature for 24 hours. After a predetermined time elapsed, water was added to the reaction mixture, and the aqueous layer was subjected to extraction with chloroform. The organic layer was washed with saturated brine, and dried with anhydrous magnesium sulfate added thereto. The obtained mixture was gravity-filtered, and the filtrate was concentrated to give an oily substance. The obtained oily substance was purified by silica gel column chromatography. Dichloromethane was used as a developing solvent. The obtained fraction was concentrated to give 3-methyl-1-(2-methylphenyl)-5-phenyl-1H-1,2,4-triazole (abbreviation: HMptzl-mp) (an orange oily substance, 84% yield). A synthesis scheme of Step 2 is shown in (a-2) below

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