A concise and effective ruthenium-catalyzed asymmetric transferhydrogenation of β-substituted α-oxobutyrolactones has been developed, delivering a series of cis-β-substituted α-hydroxybutyrolactone derivatives with excellent yields, enantioselectivities, and diastereoselectivities. Two consecutive stereogenic centers were constructed in one step through dynamic kinetic resolution under basic conditions
Facile Synthesis of α-Hydroxybutenolides and α-Keto-β-allyl-γ-butyrolactones
作者:Isao Shimizu、Takashi Maruyama、Hajime Hasegawa
DOI:10.1246/cl.1991.1349
日期:1991.8
carbonyl-γ-butyrolactones with ammonium formate in the presence of palladium catalyst gave α-hydroxybutenolides in good yields. When the reaction was carried out without ammonium formate, decarboxylation-allylation took place to give allyl enol ethers of α-hydroxybutenolides, which were converted to α-keto-β-allyl-γ-butyrolactones by the thermalClaisenrearrangement.