Enantioselective [2,3]-Wittig Rearrangement via Sparteine-Mediated Lateral Metalation of N,N-Dialkyl-o-allyloxymethylbenzamides and o-Substituted Benzyl Prenyl Ethers
Enantioselective [2,3]-Wittig Rearrangement via Sparteine-Mediated Lateral Metalation of N,N-Dialkyl-o-allyloxymethylbenzamides and o-Substituted Benzyl Prenyl Ethers
Phthalide: a direct building-block towards P,O and P,N hemilabile ligands. Application in the palladium-catalysed Suzuki–Miyaura cross-coupling of aryl chlorides
作者:James McNulty、Kunal Keskar
DOI:10.1039/c3ob40198g
日期:——
The direct synthesis of new hemilabile ligands from the economical, readily available lactone phthalide is described. Pd-complexes of one such ligand were found highly effective in general SuzukiâMiyaura cross-coupling reactions, including deactivated and hindered aryl chlorides.
Sparteine-mediated enantioselective [2,3]-Wittig rearrangement of allyl ortho-substituted benzyl ethers and ortho-substituted benzyl prenyl ethers
作者:Takeshi Kawasaki、Tetsutaro Kimachi
DOI:10.1016/s0040-4020(99)00338-5
日期:1999.5
The (−)-sparteine-mediated enantioselective [2,3]-Wittig rearrangement of N,N-dialkyl-o-allyloxymethylbenzamides and o-substituted benzyl prenyl ethers has been investigated. Enantiomeric excess up to 60% was observed as for the reaction with N,N-diethyl-o-allyloxymetylbenzamide. From the mechanistic investigations, it was suggested that the stereoinformation was introduced at the deprotonation step