The reaction of 2,3-butanedione, ethyl pyruvate, and phenylglyoxal with β-nitrostyrene and L-proline in isopropanol at room temperature gives substituted pyrrolizidines, as a result of one-pot three component reaction. On the contrary, a spiropyrrolizidine is formed from 1,2-cyclohexanedione only when the reaction is carried out in refluxing isopropanol, whereas at room temperature, incorporation of