The Wittig-cyclization procedure
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Some olefinic Wittig products, 3-deoxy-5,6-O-isopropylidene-3-C-(2'-oxopropylene)-1,2-O-alkylidene hexofuranose derivatives were converted to the branched-chain 3,6-anhydro-3-C-(2'-oxopropyl) derivatives on treatment with ion exchange resin Amberlite 120 (H+) in methanol-water at room temperature. Hydrolysis of 5,6-isopropylidene groups and intramolecular ringclosures took place in one pot reactions. (c) 2007 Elsevier Ltd. All rights reserved.