Copper-Catalyzed Cross-Coupling of Allylboronic Acids with α-Diazoketones
摘要:
Copper-catalyzed cross-coupling of substituted allylboronic acids with alpha-diazoketones was studied. This allylation reaction is highly regioselective, providing the branched allylic product. The process involves creation of a new C(sp(3))-C(sp(3)) bond by retaining the keto functional group of the alpha-diazoketone precursor.
Beyond the Tebbe Olefination: Direct Transformation of Esters into Ketones or Alkenes
作者:Anna M. Domżalska-Pieczykolan、Bartłomiej Furman
DOI:10.1055/s-0039-1691594
日期:2020.4
A direct, effective, and operationally simple transformation of esters into ketones or alkenes by the exclusive action of Tebbe’s reagent has been developed. The transformation utilizes the dual character of Tebbe’s reagent as both a methylenation agent and a rearrangement catalyst in the reaction of a wide range of substituted vinyl ethers. The resulting transformation involves sequential methylenation
Alkylation of silyl enolates with tert-alkyl or allylic fluorides proceeds smoothly in the presence of a catalytic amount of borontrifluoride to afford the corresponding carbonyl compounds. Allylation and reduction of alkylfluorides with allylsilane and hydrosilane, respectively, occur under BF3 catalysis.