γ-Allyl Phosphinoyl Phenyl Sulfone (GAPPS): A Conjunctive Reagent for the Synthesis of EE, EZ, and ET 1,3-Dienes
摘要:
A three-operation conjunctive strategy is available for the synthesis of EE, EZ, and ET dienes. This protocol employs a sequential Wadsworth-Emmons reaction using a GAPPS reagent followed by alkylation of an allylic sulfone anion, and finally ligand-mediated, palladium-catalyzed desulfonylation.
γ-Allyl Phosphinoyl Phenyl Sulfone (GAPPS): A Conjunctive Reagent for the Synthesis of EE, EZ, and ET 1,3-Dienes
摘要:
A three-operation conjunctive strategy is available for the synthesis of EE, EZ, and ET dienes. This protocol employs a sequential Wadsworth-Emmons reaction using a GAPPS reagent followed by alkylation of an allylic sulfone anion, and finally ligand-mediated, palladium-catalyzed desulfonylation.
Highly Regio- and Stereoselective Palladium(0)-Catalyzed Addition of Organoboronic Acids with 1,2-Allenic Sulfones, Sulfoxides, or Alkyl- or Aryl-Substituted Allenes in the Presence of Acetic Acid: An Efficient Synthesis of <i>E</i>-Alkenes
作者:Shengming Ma、Hao Guo
DOI:10.1055/s-2007-983822
日期:2007.9
reaction conditions were established to enable the palladium(0)-catalyzed addition of organoboronicacids with 1,2-allenic sulfones, sulfoxides, or alkyl- or aryl-substituted allenes in the presence of acetic acid. This reaction provides a new way for the stereoselective synthesis of tri- or tetrasubstituted E-alkenes. With arylboronic acids, the reactions of 1,2-allenic sulfones, sulfoxides, and alkyl-substituted