The Diene-Transmissive [4 + 2]-Cycloaddition Strategy: Stereoselective Synthesis of Advanced Intermediates to Quassinoids
摘要:
Complex intermediates to quassinoids', some optically active and containing many functional groups, were synthesized via a diene-transmissive Diels-Alder strategy. The stereochemistry of the key inter- and intramolecular cycloadditions was controlled by stereodefined groups on the preexisting C ring and on the tether.
A stereoselective diene-transmissive [4 + 2]-cycloaddition strategy for the construction of the tetracyclic quassinoid framework
摘要:
The tetracyclic quassinoid framework was stereoselectively constructed using a diene-transmissive Diels-Alder reaction between the cyclic formyl-diene 13 and ethyl vinyl ether.