L-tartaric acid is a quite useful four-carbon building block for monosaccharide synthesis. The versatility can be reinforced by the coupled use of stereoselective addition reactions where the suitable choice of organometallics leads to highly anti-selective additions. The building block is particularly useful in the synthesis of rare sugars the versatility of which is demonstrated by the synthesis of some
De Novo Asymmetric Syntheses of <scp>d</scp>- and <scp>l</scp>-Talose via an Iterative Dihydroxylation of Dienoates
作者:Md. Moinuddin Ahmed、George A. O'Doherty
DOI:10.1021/jo051476+
日期:2005.12.1
A short and highly efficient route to D- and L-talo-gamma-lactones has been developed. The key transformation was the sequential osmium-catalyzed bis-dihydroxylation reaction of substituted 2,4-dienoates. When the first dihydroxylation reaction is performed on (2Z,4E)-dienoates with use of the Sharpless AD-mix procedure, a regio- and enantioselective dihydroxylation resulted along with an in situ lactonization. A subsequent dihydroxylation, using OsO4/NMO in MeOH conditions, resulted in an exceedingly diastereo- and enantioselective synthesis of talo-gamma-lactone.
MUKAIYMA, TERUAKI;SUZUKI, KEISUKE;YAMADA, TOHRU;TABUSA, FUJIO, TETRAHEDRON, 46,(1990) N, C. 265-276