The reaction of 1-arylpropenyl-lithium (1a–c) with t-alkylbromides proceeds by either a nucleophilic substitution or single electron transfer mechanism, the preferred pathway being a function of electronicsubstituenteffects and the absence or presence of tetramethylethylenediamine or hexamethylphosphoramide.
Reaction of phenyl-substituted allyllithiums with tert-alkyl bromides. Remarkable difference in the alkylation regiochemistry between a polar process and the one involving single-electron transfer
Un chemin reactionnel polaire favorise l'attaque au niveau du site phenyl substitue (C-1) tandis qu'un couplage au niveau de l'autre site (C-3) se produit de facon predominante dans le cas d'un mecanisme SET
Un chemin reactnel polaire favourise l'attaque au niveau du site phenyl substitue (C-1) tandis qu'un couplage au niveau de l'autre site (C-3) se produit de facon predominante dans le cas d'un mecanisme SET
Nickel-Catalyzed Reductive Allylation of Tertiary Alkyl Halides with Allylic Carbonates
作者:Haifeng Chen、Xiao Jia、Yingying Yu、Qun Qian、Hegui Gong
DOI:10.1002/anie.201705521
日期:2017.10.9
of all C(sp3) quaternarycenters has been successfully achieved under Ni‐catalyzed cross‐electrophile coupling of allylic carbonates with unactivated tertiary alkyl halides. For allylic carbonates bearing C1 or C3 substituents, the reaction affords excellent regioselectivity through the addition of alkyl groups to the unsubstituted allyliccarbonterminus. The allylicalkylationmethod also exhibits