Catalytic Asymmetric Synthesis of Sterically Hindered Tertiary α-Aryl Ketones
作者:Robert Doran、Patrick J. Guiry
DOI:10.1021/jo5014806
日期:2014.10.3
The catalyticasymmetricsynthesis of a series of tertiary α-aryl cyclopentanones and cyclohexanones has been accomplished via a Pd-catalyzed decarboxylative protonation of the corresponding α-aryl-β-keto allyl esters. Enantioselectivities of up to 92% ee and 74% ee were achieved for cyclopentanone and cyclohexanone substrates, respectively. The route described gives access to these important structural
A Stereoselective Switch: Enantiodivergent Approach to the Synthesis of Isoflavanones
作者:Robert Doran、Michael P. Carroll、Ramulu Akula、Bryan F. Hogan、Marta Martins、Séamus Fanning、Patrick J. Guiry
DOI:10.1002/chem.201405246
日期:2014.11.17
A modular six‐step asymmetric synthesis of two naturally occurring and three non‐naturalisoflavanones containing tertiary α‐aryl carbonyls is reported. This synthetic route, utilising a Pd‐catalyzed decarboxylative asymmetric protonation, produces isoflavanones in excellent enantioselectivities from 76–97 %. A switch in the sense of stereoinduction was observed when different H+ sources were employed