Synthesis of a library of benzoindolizines using poly(ethylene glycol) as soluble support

A library of benzoindolizines (pyrrolo [1,5-a] quinolines 10 and pyrrolo [1,5-a] quinolines 9) has been synthesized using poly(ethylene glycol) (PEG) as soluble polymer support. However, in the presence of tetrakispyridinecobalt(II) dichromate (TPCD) the reaction of quinolinium salt 3 with alkenes 11 afforded indolizines 8, which was discovered firstly.