A Cu(I)-catalyzed coupling of a ω-chloro ketone, a primary amine, and an alkyne is described. This protocol allows for the synthesis of α-quaternary carbons in 2-alkynyl-substituted N-heterocycles. The key step is the in situ generation of a cyclic ketiminium species, which has enhanced reactivity for alkynylation compared to acyclic ketiminium species.
描述了Cu(I)催化的ω-
氯酮,
伯胺和
炔烃的偶联。该方案允许在2-炔基取代的N-杂环中合成α-季碳。关键步骤是就地生成环状酮
亚胺物种,与无环酮
亚胺物种相比,它具有更高的烷基化反应活性。