Different Behaviors of a Cu Catalyst in Amine Solvents: Controlling N and O Reactivities of Amide
作者:Yu Yamane、Koichiro Miyazaki、Takashi Nishikata
DOI:10.1021/acscatal.6b02309
日期:2016.11.4
Controlling the reactivity of the nitrogen or oxygen nucleophile of an amide group to form C–N or C–O bonds by tuning reaction conditions is one of the most challenging issues in the use of amides in organic synthesis. Both nucleophiles in the amide group can individually participate in reactions, and most reactions employ a substrate-controlled methodology to achieve selectivity. However, in the reaction
α-Bromoamides and styrenes underwent iminolactonization reactions (carbooxygenation), in which simultaneous C–C and C–O formation occurred in the presence of a copper catalyst with triethylamine as the base. Conversely, olefinationreactions occurred in the presence of a Cu catalyst with piperidine as the base. The selectivities in those reactions were very high.