Etude de la regioselectivite de la substitution des carbanions par des derives allyliques catalysee au palladium. Obtention selective de composes a carbone quaternaire
作者:Thérèse Cuvigny、Marc Julia、C. Rolando
DOI:10.1016/0022-328x(85)87384-8
日期:1985.4
carbanions and ligands on π-allylpalladium has been investigated in the substitution of primary or tertiary terpene derivatives. Conditions have been found under which the substitution takes place essentially at one or the other end of the allylic system. This provides a new and convenient way to obtain compounds with quaternary carbonatoms, which has been exemplified by the synthesis of 3,3-dimethyl-4-pentenenitrile
Palladium-catalyzed allylic alkylation of carbonucleophiles witl allylic borates or allylic alcohols and boron oxide under neutral conditions
作者:Xiyan Lu、Xiaohui Jiang、Xiaochun Tao
DOI:10.1016/0022-328x(88)80217-1
日期:1988.4
Underneutralconditions, Pd(PPh3)4 catalyzes the allylic alkylation of carbonucleophiles with allylic borates in high yields. Moreover, allylic borates are formed in situ from allylic alcohols with boron oxide, and the Pd-cata;yzed allylic alkylation was achieved simply by the reaction of allylic alcohols with a nucleophile in the presence of boron oxide by one-pot procedure. The mechanisms of these