De Novo Asymmetric Synthesis of Daumone via a Palladium-Catalyzed Glycosylation
作者:Haibing Guo、George A. O'Doherty
DOI:10.1021/ol051383e
日期:2005.9.1
upon a diasteroselective palladium-catalyzedglycosylationreaction for the formation of the anomeric bond. The asymmetry of the sugar and aglycone portion of daumone were introduced by Noyori reduction of an acylfuran and a propargyl ketone. A highly diastereoselective epoxidation and reductive ring opening established the desired C-2 and C-4 stereochemistry of daumone. [reaction: see text]
Asymmetric Catalytic Alkynylation of Acetaldehyde: Application to the Synthesis of (+)-Tetrahydropyrenophorol
作者:Barry M. Trost、Adrien Quintard
DOI:10.1002/anie.201203035
日期:2012.7.2
In control: By controlling the kinetics of alkynylation over aldolization, the challenging asymmetriccatalyticalkynylation of acetaldehyde has been realized. The resulting products are attractive synthons which are produced with good to excellent enantiocontrol, and show broad tolerance and applicability, as demonstrated by the synthesis (+)‐tetrahydropyrenophorol.