Synthesis of seven- and eight-membered carbasugar analogs via ring-closing metathesis and their inhibitory activities toward glycosidases
An expeditious and efficient synthesis of new enantiopure polyhydroxylated seven- and eight-membered carbocycles is described starting from 2,3.5-tri-O-benzyl-D-arabinose. The key cyclization step involves ring closing metathesis of 1,8- and 1,9-dienes using Grubbs' catalyst. All of the new carbasugar analogs synthesized were evaluated as glycosidase inhibitors. Contrary to Our expectations, (1 S,2S,3R,4R,5R)-1-(hydroxymethyl)-cyclohepta-1,2,3,4,5-pentol which has the beta-D-mannopyranose configuration for C(1)-C(5) inhibits alpha- and beta-glucosidases, whereas its diepimer (1S,2S,3R,4S,5S)-1-(hydroxymethyl)-cyclohepta-1,2,3,4,5-pentol, which has the alpha-D-glucopyranose configuration, is not recognised by these enzymes. (C) 2002 Elsevier Science Ltd. All rights reserved.
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Ecole Normale Super, Dept Chim, UMR 8642, F-75231 Paris 05, France. Ecole Polytech Fed Lausanne, Inst Chim Mol & Biol, BCH, CH-1015 Lausanne, Switzerland.
Record created on 2005-11-09, modified on 2016-08-08