p-Selective (sp2)-C-H functionalization of electron rich arenes have been achieved for acylation and alkylation reaction, respectively, with acyl/alkylselenides by organic photoredox catalysis involving interesting mechanistic pathway.
Iridium‐Catalysed Reductive Deoxygenation of Ketones with Formic Acid as Traceless Hydride Donor
作者:Zhiheng Yang、Xueya Zhu、Shiyi Yang、Weiyan Cheng、Xiaojian Zhang、Zhanhui Yang
DOI:10.1002/adsc.202000821
日期:2020.12.8
An iridium‐catalysed deoxygenation of ketones and aldehydes is achieved, with formic acid as hydride donor and water as co‐solvent. At low catalyst loading, a number of 4‐(N,N‐disubstituted amino) arylketones are readily deoxygenated in excellent yields and chemoselectivity. Numerous functional groups, especially phenolic and alcoholic hydroxyls, secondary amine, carboxylic acid, and alkyl chloride
以甲酸为氢化物供体,水为助溶剂,实现了铱催化的酮和醛的脱氧。在低催化剂负载下,许多4-(N,N-二取代氨基)芳基酮易于脱氧,具有出色的收率和化学选择性。许多官能团,尤其是酚羟基和醇羟基,仲胺,羧酸和烷基氯,都具有良好的耐受性。当使用DCO 2 D和D 2 O代替它们的氢化对应物时,可获得双歧化的双链烷烃达90%。激活4‐(N,N已证明二取代氨基)芳基会经历各种有用的转化。脱氧氘已用于制备氘代药物分子Chlorambucil-4,4- d 2。
Vinyl Triflate–Aldehyde Reductive Coupling–Redox Isomerization Mediated by Formate: Rhodium‐Catalyzed Ketone Synthesis in the Absence of Stoichiometric Metals
作者:William G. Shuler、Robert A. Swyka、Tabitha T. Schempp、Brian J. Spinello、Michael J. Krische
DOI:10.1002/chem.201903668
日期:2019.9.25
Direct conversion of aldehydes to ketones is achieved via rhodium-catalyzed vinyl triflate-aldehyde reductive coupling-redox isomerization mediated by potassium formate. This method circumvents premetalated C-nucleophiles and discrete redox manipulations typically required to form ketonesfrom aldehydes.
Mesoionic Carbene‐Catalyzed Formyl Alkylation of Aldehydes
作者:Chang Liu、Zengyu Zhang、Liang‐Liang Zhao、Guy Bertrand、Xiaoyu Yan
DOI:10.1002/anie.202303478
日期:2023.6.12
A metal-free protocol for the coupling reaction of aldehydes and alkyl halides was successfully developed with mesoionic carbenes (MICs) as catalysts. This versatile strategy delivers a large diversity of simple ketones as well as bio-active molecules by late-stage functionalization.