Enantioselective Conversion of Achiral Cyclohexadienones to Chiral Cyclohexenones by Desymmetrization
作者:Yixin Han、Simon Breitler、Shao-Liang Zheng、E. J. Corey
DOI:10.1021/acs.orglett.6b03186
日期:2016.12.2
The enantioselective reduction of prochiral 4,4-disubstituted 2,5-cyclohexadienones to chiral 2-cyclohexenones has been accomplished by the use of a carefully selected chiral bisphosphine–CuI complex and diisobutylaluminum hydride–hexamethylphosphoric triamide complex. This reagent has provided access to a key bicyclic intermediate for the totalsynthesis of the natural enantiomer of the pentacyclic
Highly Diastereoselective Cationic Cyclization Reactions Convert a Common Monocyclic Enone to Bicyclic Precursors for the Synthesis of Retigeranic Acids A and B
作者:Simon Breitler、Yixin Han、E. J. Corey
DOI:10.1021/acs.orglett.7b03412
日期:2017.12.15
A novel method is demonstrated for the diastereoselective conversion of a monocyclic enone to a pair of bicyclic intermediates which enable the stereocontrolled enantioselective syntheses of retigeranic acids A and B.