Sodium Hydroxide → 1-(4-Methoxybenzyl)-5-(4,5-dimethoxy-2-nitrobenzoyl)-1,2,3-triazole-4-carboxylic acid

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In the same manner as above, a solution of ethyl 1-(4-methoxybenzyl)-5-(4,5-dimethoxy-2-nitrobenzoyl)-1,2,3-triazole-4-carboxylate (b-2) (3.12 g, 6.63 mmole) in tetrahydrofuran (100 ml) was hydrolyzed with a 1N aqueous sodium hydroxide solution (13 ml) at room temperature for 3.5 hours to give 1-(4-methoxybenzyl)-5-(4,5-dimethoxy-2-nitrobenzoyl)-1,2,3-triazole-4-carboxylic acid (c-2': MP) (2.32 g, 79%)

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