Aza-Wacker-Type Reaction between Electron-Deficient Olefins and N-Alkylsulfonamides
摘要:
A palladium-catalyzed oxidative amination protocol of electron-deficient olefins by aza-Wacker-type reaction with N-alkylsulfonamides was developed. The presence of the stoichiometric amount of methanesulfonic acid was crucial for the success of this transformation. The reactions were conducted in green solvent under mild conditions and scalable with excellent E-type stereoselectivity. In addition, a Pd(II)/Pd(0) catalytic cycle with the existence of a very strong oxidant (Selectfluor) was proposed.
[2,3]-Wittig rearrangements of (E)-3-aza-allylic alcohol derivatives can provide access to functionalized 1,2-aminoalcohols with high syn or anti diastereoselectivity depending on the anionic stabilizing group (amide or alkyne).