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Sugar\u2010fused or sugar\u2010linked butenolides can be constructed by an efficient reaction sequence involving Wittig olefination of 3\u2010 or 5\u2010keto sugars and intramolecular cyclization of the intermediate \u03b3\u2010hydroxy \u03b1,\u03b2\u2010unsaturated esters. The antimicrobial activities of the products and that of a known sugar\u2010derived pyranoid \u03b1,\u03b2\u2010unsaturated \u03b4\u2010lactone were investigated against six pathogenic bacteria and six fungi. The pyranoid \u03b1,\u03b2\u2010unsaturated \u03b4\u2010lactone <jats:bold>29<\/jats:bold> proved to be the most active compound in this series towards the plant pathogenic fungi <jats:italic>Colletotrichum coffeanum<\/jats:italic> (coffee berry disease) and <jats:italic>Pyricularia oryzae<\/jats:italic> (rice blast disease).(\u00a9 Wiley\u2010VCH Verlag GmbH &amp; Co. KGaA, 69451 Weinheim, Germany, 2008)<\/jats:p>","DOI":"10.1002\/ejoc.200800763","type":"journal-article","created":{"date-parts":[[2008,11,10]],"date-time":"2008-11-10T07:18:42Z","timestamp":1226301522000},"page":"6134-6143","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Synthesis and Biological Evaluation of Sugars Containing \u03b1,\u03b2\u2010Unsaturated \u03b3\u2010Lactones"],"prefix":"10.1002","volume":"2008","author":[{"given":"Nuno M.","family":"Xavier","sequence":"first","affiliation":[]},{"given":"Sandrina","family":"Silva","sequence":"additional","affiliation":[]},{"given":"Paulo J. A.","family":"Madeira","sequence":"additional","affiliation":[]},{"given":"M. Helena","family":"Flor\u00eancio","sequence":"additional","affiliation":[]},{"given":"Filipa V. 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