The reaction of β-ketonitrile andN-substituted pyrrole-2-carboxaldehyde in the presence of piperidinium acetate in CH3CN permitted regioselective access to 5-acylindolizine-7-carbonitrile through a domino Knoevenagel condensation-intramolecular aldol cyclization sequence. A wide range of new indolizine derivatives with a poly-functionalized pyridine moiety were readily synthesized in an atom-economical fashion, thereby expanding the indolizine chemical space for further applications.
Bibliographical noteFunding Information:
We thank the National Research Foundation of Korea (NRF-2018R1A6A1A03023718 and NRF-2020R1A2C2005961) for generous financial support.
© The Royal Society of Chemistry 2021.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Organic Chemistry