Abstract
Matteson homologations of chiral boronic esters with lithium dichlorocarbenoids and various nucleophiles proved to be a useful method for the synthesis of functionalized polyketides in a highly stereoselective fashion. Via repeated homologation steps, only 1,2-anti- and 1,3-syn-configured products were obtained. Homologation with substituted carbenoids followed by reaction with carbon nucleophiles resulted in configurationally inverted products and tertiary boronic esters in a highly stereoselective fashion. This approach significantly expands the potential of the Matteson reaction.
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