Tetrahydropyran Synthesis by Intramolecular Conjugate Addition to Enones: Synthesis of the Clavosolide Tetrahydropyran Ring
作者:Roderick Bates、Ping Song
DOI:10.1055/s-0030-1257890
日期:2010.9
The synthesis of a tetrahydropyran intermediate for clavosolide A is reported, employing a combination of cross-metathesis and intramolecular oxa-Michael addition. The intramolecular oxa-Michael addition to α,β-unsaturated esters requires the use of strong bases and can result in either modest yields or stereoisomeric mixtures, and can be highly variable according to the substrate structure. In contrast