Trimethylsilyldiazomethane → Methyl 6-ureidohexanoate

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A solution of 6-ureidohexanoic acid (0.996 g, 5.72 mmol, 1.0 equiv) in methanol/benzene (2:7, 60 mL) was cooled to 0 degrees C., and a solution of trimethylsilyldiazomethane in hexanes (2.0 M, 3.43 mL, 6.86 mmol, 1.2 equiv) was added. The reaction mixture was warmed to room temperature and stirred for 1 h prior to removing all volatile components in vacuo. The crude methyl ester (1.06 g, 5.61 mmol, 98%) was used without further purification in the Biginelli reaction.

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