Intramolecular Lewis-acid promoted (2+2) cycloadditions: An efficient total synthesis of (±)-coronafacic acid via an internal Diels-Alder reaction.
作者:Michael E. Jung、Kim M. Halweg
DOI:10.1016/s0040-4039(01)90538-6
日期:1981.1
Internal (2+2) cycloaddition of the ester gave the cyclobutene in fair yield; cyclization of the readily derived trienone and hydrolysis produced coronafacic acid in 7% overall yield.
Expedient Stereoselective Synthesis of Coronafacic Acid Through Intramolecular Diels−Alder Cyclization
作者:Benoît Moreau、Maryon Ginisty、Dino Alberico、André B. Charette
DOI:10.1021/jo062099j
日期:2007.2.1
reaction as the key step. The triene precursor bearing a substituted diene and a vinylketone as dienophile was synthesized and then tested in the thermal intramolecular cyclization. We have devised a new strategy to assemble the E,Z-diene through the stereoselective aldol reaction of an ester enolate followed by a stereoselective dehydration. Following the thermal cyclization, the corresponding hydrindanone