Domino Knoevenagel Condensation/Intramolecular Aldol Cyclization Route to Diverse Indolizines with Densely Functionalized Pyridine Units
2013
Kim, Myungock | Jung, Youngeun | Kim, Ikyon
A highly efficient [4 + 2] annulation route to polysubstituted indolizines is described employing a domino Knoevenagel condensation/intramolecular aldol cyclization process as a key step. Construction of pyridine rings in indolizine skeleton was rapidly achieved from several pyrrole-2-carboxaldehydes in good to excellent yields, leading to indolizines with various substituents at the 5, 6, and 7 positions depending on the reacting active methylene partners.
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