Kinetic resolutions of the racemicaldehydes 3a-c by reaction with chiral phosphonopropionates 2 have been studied. Reagent 2d gives (Z)-alkene products in good yields and diastereoselectivities from all three substrates.
scope of the Prins cyclisation, the higher stereoselectivesynthesis of multisubstituted tetrahydropyransfrom aldehydes and homoallylic alcohols, is expanded. A new approach for the stereoselectivesynthesis of polyketide precursors containing anti-1,3-diols, flanked by a variety of alkyl branches and functional groups is described. The approach is successfully exploited for the synthesis of (−)-sedamine
An efficient and convenient rhodium-catalyzed formylation of alkyl chlorides to synthesize aldehydes has been developed. Depending on the conditions both linear and branched aldehydes can be obtained in a selective manner from readily available substrates.