Trifluoroacetic acid → 2-(2-amino-ethyl)-4-phenyl-1H-pyrrole-3-carboxylic acid ethyl ester

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A stirred solution of 2-(2-tert-butoxycarbonylamino-ethyl)-5-formyl-4-phenyl-1H-pyrrole-3-carboxylic acid ethyl ester (1.120 g, 3 mmol) in dichloromethane (32 ml) was added dropwise slowly with trifluoroacetic acid (3.2 ml) at room temperature. Upon completion of the addition, the mixture was stirred for 3 hours, and concentrated to give 2-(2-amino-ethyl)-4-phenyl-1H-pyrrole-3-carboxylic acid ethyl ester which was used as such.

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