Intramolecular Diels-Alder Reactions of 2(1H)-Pyrazinones: Synthesis of New Furo/Pyrano-pyridinones and -pyridines

Article abstract of DOI:10.1016/0040-4020(95)00802-F

2(1H)-Pyrazinones 2-5 with in 3-position either a 3- or 4-alkynyloxy side chain and 2(1H)-pyrazinones 9-10 carrying the corresponding 2- or 3-alkynyloxy(m)ethyl substituent are shown to undergo intramolecular Diels-Alder reaction.The formation of either f