Synthesis 2002(5): 0619-0624
DOI: 10.1055/s-2002-23550
PAPER
© Georg Thieme Verlag Stuttgart · New York

Chiral Dihydroxyacetone Equivalents in Synthesis: An Expedient Diastereo- and Enantioselective Synthesis of Differentially Protected Ketopolyols

Dieter Enders*, Stuart J. Ince
Institut für Organische Chemie, Rheinisch-Westfälische Technische Hochschule, Professor-Pirlet-Straße 1, 52074 Aachen, Germany
Fax: +49(241)8092127; e-Mail: Enders@RWTH-Aachen.de;
Further Information

Publication History

Received 20 February 2002
Publication Date:
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.

19

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]

20

Dimethyldioxirane has been proposed as an alternative oxidising agent in these systems. See Ref. [11]