A new modification of Julia-Kocienski olefination reaction based on the use of cation-specific chelating agents that yields 1,3-dienes with predictable (E/Z)-selectivity on newly created double bond was developed. The influence of the aldehyde Structure on reaction (E/Z) selectivity is discussed and rationalized.
Chemo-enzymatic asymmetric total synthesis of penienone
作者:Tridib Mahapatra、Rajib Bhunya、Samik Nanda
DOI:10.1016/j.tetlet.2009.07.043
日期:2009.9
An asymmetricsynthesis of penienone has been accomplished from (R)-5-hydroxymethyl-2-cyclohexenone by adopting a linear strategy. Lipase-PS-catalyzed enzymatic kinetic resolution (EKR) and Julia–Kocienski olefination followed by substrate-directed anionic hydroxymethylation have been successfully employed to achieve the target molecule.