Intramolecular Lewis-acid promoted (2+2)
✍
Michael E. Jung; Kim M. Halweg
📂
Article
📅
1981
🏛
Elsevier Science
🌐
French
⚖ 232 KB
INTRAMOLECULAR LEWIS-ACID PROMOTED (2+2) CYCLOADDITIONS: AN EFFICIENT TOTAL SYNTHESIS OF (+)-CORONAFACIC ACID VIA AN INTERNAL DIELS-ALDER REACTION.' Internal (2+2) cycloaddition of the ester 1 gave the cyclobutene 8 in fair yield; cyclization of the readily derived trienone i and hydrolysis produced