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A concise and stereoselective synthesis of the key intermediate used for constructing the BC-ring fragment of (+)-spirastrellolide A is described. The synthetic sequence represents a chiron approach that employs readily available and inexpensive l-arabinose and sets up the stereochemical triad at C20–C22 all from the sugar. This lactone can be used to assemble the spiroketal in the Southern Half through...
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