Stereocontrolled Syntheses of (−)-Cubebol and (−)-10-Epicubebol Involving Intramolecular Cyclopropanation of α-Lithiated Epoxides
作者:David M. Hodgson、Saifullah Salik、David J. Fox
DOI:10.1021/jo9022974
日期:2010.4.2
syntheses of 7-epicubebol (33) and (from (+)-menthone) of naturally occurring (−)-10-epicubebol (39), confirming the original structural assignment. Computational studies support the origin of the inversion as being rate-determining formylation of cis-enolate 27 from a mixture of rapidly interconverting enolates. In the synthesis of 7-epicubebol (33), allylic tertiary C−H insertion is observed as a significant