One-pot synthesis of functionalized dihydroindolizinones from pyrrolylpropynoates and diethyl aminomalonate

3-(Pyrrol-2-yl)propynoates react with diethyl aminomalonate hydrochloride (excess Cs₂CO₃, reflux in MeCN, 6 h) to chemoselectively afford 8-amino-4-oxo-5,6-dihydroindolizine-7-carboxylates in good yields (62–85%).