Abstract
Reaction of sulfur ylides with suitably 4-functionalized-5,5-dimethyl-2-cyclopentenones allows an efficient entry to the bicyclo[3.1.0]hexan-2-one skeleton which proved to be a valuable precursor of vinyl cyclopropane carboxylic acids. Application to the synthesis of ( d, l)- and ( d)-( cis)-chrysanthemic acid is described.
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