Primary β-Amino Acid Salt-catalyzed Asymmetric Michael Addition of Benzoylacetates to Cyclic Enones and Its Application for the Synthesis of Enantioenriched 1,5-Diketones
palladium-catalyzed alkoxycarbonylation of an α-chloro ketone can be efficiently combined to a Michaeladditionreaction in a new two-step dominoreaction, allowing the synthesis of original highly functionalized α-alkylated β-ketoesters. The scope of the reaction was extended to several α-chloro ketones and Michael acceptors with moderate to very good yields.
Primary β-Amino Acid Salt-catalyzed Asymmetric Michael Addition of Benzoylacetates to Cyclic Enones and Its Application for the Synthesis of Enantioenriched 1,5-Diketones
作者:Masanori Yoshida、Ami Kubara、Shoji Hara
DOI:10.1246/cl.2013.180
日期:2013.2.5
The asymmetric Michael addition of benzoylacetates to cyclic enones was successfully carried out by using a primary β-amino acid salt catalyst. The reactions proceeded under mild reaction conditions to produce Michael adducts in high yields and with high enantioselectivities. The obtained Michael adducts were converted into β-benzoylmethylated cyclic ketones by decarboxylation without a significant loss of enantiomeric excess.