p-Toluenesulfonic acid → ethyl 2-(ethoxymethyl)-5-(4,5-dimethoxy-2-nitrobenzoyl)-2H-1,2,3-triazole-4-carboxylate

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Reaction Conditions

Reaction Steps

Ethyl 5-(4,5-dimethoxy-2-nitrobenzoyl)-1H-1,2,3-triazole-4-carboxylate (Synthesis Example 2) (210 mg) and p-toluenesulfonic acid mohohydrate (62 mg) were suspended in methylene chloride (5 ml) under an argon atmosphere. Diethoxymethane (0.5 ml) was added to the suspension. The mixture was stirred at 80° C. for 2 hr. The mixture was post-treated by a conventional method and subjected to separation and purification to give ethyl 2-(ethoxymethyl)-5-(4,5-dimethoxy-2-nitrobenzoyl)-2H-1,2,3-triazole-4-carboxylate (242 mg, 99%) as a yellow powder.

Provenance & Evidence