Ring opening of dihydro-2-pyridones and intramolecular Diels–Alder reactions
作者:Shang-Shing P. Chou、Chien-Jung J. Wu
DOI:10.1016/j.tet.2011.11.060
日期:2012.1
A new ring-opening reaction of 5,6-dihydro-2-pyridones was discovered. Compounds 1 and 7 were converted to the dienoic amides 2 and 8 by reaction with sodium hydride at room temperature. N-Allylation of compounds 2 and 8 followed by IMDA reaction provided the cis-fused hexahydro-1-indolones 5 and 10, respectively. Treatment of compounds 5 and 10 with DBU in refluxing ethyl acetate gave the conjugated