8-acetyl-6-(dibenzo[b,d]thiophen-4-yl)-2,3-dihydroindolizin-5(1H)-one

8-acetyl-6-(3,4-dimethoxyphenyl)-2,3-dihydroindolizin-5(1H)-one

8-acetyl-6-(benzo[d][1,3]dioxol-5-yl)-2,3-dihydroindolizin-5(1H)-one

8-acetyl-6-(4-(tert-butyl)phenyl)-2,3-dihydroindolizin-5(1H)-one

8-cyano-5-oxo-1,2,3,5-tetrahydroindolizin-6-yl trifluoromethanesulfonate