Enantiopure Dicyclopropanes from trans-Cyclohexadienediols

[摘要]：The protecting-group-induced highly regio- and enantioselective syntheses of dicyclopropanated building blocks starting from microbially produced trans-2,3-dihydroxy-2,3-dihydrobenzoic acid are described. Key to the success was a two-step cycloaddition-photolysis sequence for the second cyclopropanation. The structure of the unexpected inverse [3+2]-cycloaddition product of the 1,3-dipolar cycloaddition was verified.

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