Acid- and Base-Switched Palladium-Catalyzed γ-C(sp<sup>3</sup>)–H Alkylation and Alkenylation of Neopentylamine
作者:Jinquan Zhang、Shuaizhong Zhang、Hongbin Zou
DOI:10.1021/acs.orglett.1c00903
日期:2021.5.7
unactivated C(sp3)–H and the reaction selectivity are among the core pursuits for transition-metal catalytic system development. Herein, we report Pd-catalyzed γ-C(sp3)–H-selective alkylation and alkenylation with removable 7-azaindole as a directing group. Acid and base were found to be the decisive regulators for the selective alkylation and alkenylation, respectively, on the same single substrate under otherwise
远程未活化C(sp 3)–H的功能化和反应选择性是过渡金属催化系统开发的核心追求。在本文中,我们报道了Pd催化的γ-C(sp 3)–H-选择性烷基化和烯基化反应,其中可移动的7-氮杂吲哚为指导基团。发现在相同的单一底物上,否则在相同的反应条件下,酸和碱分别是选择性烷基化和烯基化的决定性调节剂。各种丙烯酸酯都适合形成C(sp 3)–C(sp 3)和C(sp 3)–C(sp 2)债券。烯基化方案可以进一步扩展至具有天然产物单元和α,β-不饱和酮的丙烯酸酯。烷基化和烯基化产物的初步合成操作证明了该策略在结构上多样化的脂族链延伸和官能化方面的潜力。机理实验研究表明,酸性和碱性催化转化共有相同的六元二聚体palladacycle。