1,2,3-Triazoles as versatile directing group for selective sp2 and sp3 C–H activation: cyclization vs substitution
作者:Xiaohan Ye、Zhengrong He、Tonia Ahmed、Keith Weise、Novruz G. Akhmedov、Jeffrey L. Petersen、Xiaodong Shi
DOI:10.1039/c3sc51211h
日期:——
Selective cyclization and substitution was achieved with designated 1,2,3-triazole acid auxiliary groups under Pd catalyzed CâH activation conditions. Both sp2 and sp3 CâH bonds were effectively activated, giving the desired products in good yields. This result revealed the first successful example of exclusive substitution using 1,2,3-triazole ligands, while another triazole-containing directing group dominantly gave cyclization under identical conditions.
在Pd催化的C-H活化条件下,通过特定的1,2,3-三唑酸辅助基团实现了选择性的环化和取代反应。无论是sp²还是sp³ C-H键都能有效地被活化,以良好的产率得到目标产物。这一结果揭示了首次成功利用1,2,3-三唑配体进行专属取代的例子,而在相同条件下,另一含三唑的导向基则主要发生环化反应。