De novo synthesis of galacto-sugar δ-lactones via a catalytic osmium/palladium/osmium reaction sequence
摘要:
A highly efficient route to various 1,5-galacto-sugar lactones from dienoates has been developed by using three catalytic reactions. These reactions include (i) an enantioselective osmium-catalyzed dihydroxylation, (ii) a regio- and diastereoselective palladium-catalyzed pi-allyl alkylation with p-methoxyphenol for alcohol differentiation and protection, and (iii) a diastereoselective dihydroxylation that can be improved using matched emantioselective osmium-catalyzed dihydroxylation condition. (c) 2005 Elsevier Ltd. All rights reserved.
De novo synthesis of galacto-sugar δ-lactones via a catalytic osmium/palladium/osmium reaction sequence
作者:Md. Moinuddin Ahmed、George A. O’Doherty
DOI:10.1016/j.tetlet.2005.03.029
日期:2005.4
A highly efficient route to various 1,5-galacto-sugar lactones from dienoates has been developed by using three catalytic reactions. These reactions include (i) an enantioselective osmium-catalyzed dihydroxylation, (ii) a regio- and diastereoselective palladium-catalyzed pi-allyl alkylation with p-methoxyphenol for alcohol differentiation and protection, and (iii) a diastereoselective dihydroxylation that can be improved using matched emantioselective osmium-catalyzed dihydroxylation condition. (c) 2005 Elsevier Ltd. All rights reserved.
De novo asymmetric syntheses of C-4-substituted sugars via an iterative dihydroxylation strategy
作者:Md. Moinuddin Ahmed、George A. O’Doherty
DOI:10.1016/j.carres.2006.03.024
日期:2006.7
highly efficient route to various C-4 substitutedsugar lactones has been developed. The key to the overall transformation is the sequential osmium-catalyzed dihydroxylation reaction of substituted 2,4-dienoates and an allylic substitution at the C-4 position. When the Sharpless AD-mix procedure is used in a matched sense for the second dihydroxylation reaction, it results in an exceedingly diastereo-