Ammonia → 2-Aminocarbonylamino-5-(2-naphthyl)pyrrole-3-carboxamide

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Reaction Steps

Trichloroacetyl isocyanate (470 μL, 4.0 mmol) was added dropwise to a solution of 2-amino-5-(2-naphthyl)pyrrole-3-carboxamide (Reference compound No. 1-1, 1.0 g, 4.0 mmol) in anhydrous tetrahydrofuran (20 mL) at −30° C. over 5 minutes, and the whole was stirred for 1.5 hours. Furthermore, 2.0 M ammonia solution in methanol (20 mL, 40 mmol) was added thereto, and the whole was stirred at room temperature for 3 days. The precipitated solid was filtered off and washed with a mixed solvent of diethylether-ethanol (3:1) (20 mL). The obtained solid was dried at 40° C. under reduced pressure to give the target compound (0.67 g) as a pale gray solid (Yield 58%).

Provenance & Evidence