Addition reactions of heterocyclic compounds. Part LXIV. Indolizines from reactions of hex-3-yne-2,5-dione, but-3-yn-2-one, and allene-carboxylic esters with some nitrogen-containing heterocyclic ylides
Abstract
Pyridinium methylides combine with hex-3-yne-2,5-dione, but-3-yn-2-one, methyl but-2-ynoate, methyl phenyl-acetylenecarboxylate, dimethyl penta-2,3-dienedioate, and ethyl 2-methylbuta-2,3-dienoate and 2-methylpenta-2,3-dienoate to give indolizines, identified from spectra.