Functionalized organolithium reagents in the synthesis of chiral ligands for catalytic enantioselective addition of diethylzinc to aldehydes

Regio- and stereoselective intermolecular carbolithiation reactions

Carbolithiation of alkenes provides a powerful tool for the construction of up to two novel carbon–carbon or carbon–heteroatoms bonds in a regio- and stereo-controlled manner. The synthetic potentiality of this reaction is highlighted.

Synthesis of Sterically-Crowded Olefins, gem-Dihaloalkenes, Butatrienes, and Thioketenes through the Reaction of Substituted Bornane-2-thiones or Bornane-2-selones with Conventional Carbenes or Metal Carbenoids

Reaction of highly-substituted bornane-2-selones with a diazoalkane in the presence of either Rh2(OAc)4 or CuCl formed sterically-crowded exo-methylenic products, and similar treatment of the thiones or selones with dihalocarbenes or a propadienylidene carbene also formed dihaloalkenes, butatrienes, and thioketenes. All these reactions were assumed to proceed through a pathway involving the in situ formation and subsequent ring closure of chalcogenocarbonyl ylides.