Transition-metal-catalyzed C–H alkylation reactions directed by aldehydes or ketones have been largely restricted to electronically activated alkenes. Herein, we report a general protocol for the Ir(III)-catalyzed ortho C–H alkylations of (hetero)aromatic aldehydes using alkyl boron reagents as the coupling partner. Featuring aniline as an inexpensive catalytic ligand, the method was compatible with a wide variety of benzaldehydes, heterocyclic aldehydes, potassium alkyltrifluoroborates as well as a few α,β-unsaturated aldehydes. An X-ray crystal structure of a benzaldehyde ortho C–H iridation intermediate was also successfully obtained.

中文翻译：

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使用烷基硼试剂进行 Ir(iii) 催化的（杂）芳香醛的邻位 C–H 烷基化†

由醛或酮引导的过渡金属催化的 C-H 烷基化反应在很大程度上仅限于电子活化的烯烃。在此，我们报告了使用烷基硼试剂作为偶联伙伴的 Ir(III) 催化的（杂）芳香醛的邻位 C–H 烷基化的通用方案。该方法以苯胺作为廉价的催化配体为特色，与多种苯甲醛、杂环醛、烷基三氟硼酸钾以及一些 α,β-不饱和醛相容。还成功获得了苯甲醛邻位C-H铱中间体的X射线晶体结构。