One-pot selective oxidation/olefination of primary alcohols using TEMPO–BAIB system and stabilized phosphorus ylides
作者:Jean-Michel Vatèle
DOI:10.1016/j.tetlet.2005.11.100
日期:2006.1
A one-pot process for the synthesis of α,β-unsaturated esters from a variety of alcohols, obtained in good yields and diastereoselectivities, is described. The use of BAIB/TEMPO system at the oxidizing step authorizes the chemoselective homologation of primary alcohols in the presence of secondary ones.
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-