In this work, we demonstrated Ni-catalyzed oxidative coupling of unactivated C(sp(3))-H bonds with terminal alkynes for construction of C(sp(3))-C(sp) bonds to synthesize alkyl-substituted internal alkynes. Different amides exhibited good compatibility. Preliminary mechanistic studies were conducted to account for this alkynylation.
Readily Removable Directing Group Assisted Chemo- and Regioselective C(sp<sup>3</sup>)H Activation by Palladium Catalysis
作者:Yun-Fei Zhang、Hong-Wei Zhao、Hui Wang、Jiang-Bo Wei、Zhang-Jie Shi
DOI:10.1002/anie.201505932
日期:2015.11.9
Currently used directing groups for selective aliphatic β‐functionalization of carbonyl compounds show excellent reactivity and selectivity with an amide as a linker. Described herein is 2‐piconimide, used for the first time with commercially available 2‐picolinamide/2‐picolic acid as precursors, to directCH arylation/alkenylation by palladium catalysis. The directing group is essential for promoting