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DOI: 10.1055/s-2002-23550
Chiral Dihydroxyacetone Equivalents in Synthesis: An Expedient Diastereo- and Enantioselective Synthesis of Differentially Protected Ketopolyols
Publikationsverlauf
Publikationsdatum:
02. April 2002 (online)
Abstract
A highly diastereo- and enantioselective entry to higher order ketopolyols, employing boron-mediated aldol reactions of a chiral dihydroxyacetone equivalent, is reported. The differentially protected products should prove as useful building blocks for polyhydroxylated natural product synthesis.
Key words
chiral dihydroxyacetone equivalent - α-substituted ketones - aldol reactions - polyols - asymmetric synthesis
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The one-pot bis-aldol reaction of 2,2-dimethyldioxan-5-one by enolisation, reaction with PhCHO, a second enolisation and then reaction with CyCHO was recently reported. The racemic anti-trans-anti product was isolated in 64% yield. See Ref. [11]
20Dimethyldioxirane has been proposed as an alternative oxidising agent in these systems. See Ref. [11]