An Efficient and Scalable Ritter Reaction for the Synthesis of <i>tert</i>-Butyl Amides
作者:Jean C. Baum、Jacqueline E. Milne、Jerry A. Murry、Oliver R. Thiel
DOI:10.1021/jo8024797
日期:2009.3.6
A scalable procedure for the conversion of nitriles to N-tert-butyl amides via the Ritter reaction was optimized employing tert-butyl acetate and aceticacid. The reaction has a broad scope for aromatic, alkyl, and α,β-unsaturated nitriles.
Exploiting the Reactivity of Isocyanide: Coupling Reaction between Isocyanide and Toluene Derivatives Using the Isocyano Group as an N1 Synthon
作者:Zhiqiang Liu、Xinglu Zhang、Jianxiong Li、Feng Li、Chunju Li、Xueshun Jia、Jian Li
DOI:10.1021/acs.orglett.6b01928
日期:2016.8.19
An unusual oxidative coupling reaction of isocyanide and toluene derivatives using tetrabutylammonium iodide (TBAI) as a catalyst is disclosed. The experimental results and mechanistic study show that the isocyano group acts formally as an N1 synthon during the transformation, thus expanding the reactivity profile of isocyanide.
A regioselective radical C–H trifluoromethylation of aromaticcompounds was developed using cyclodextrins (CDs) as additives. The C–H trifluoromethylation proceeded with high regioselectivity to afford the product in good yield, even on the gram scale. In the presence of CDs, some substrates underwent a single trifluoromethylation selectively, whereas mixtures of single- and double-trifluoromethylated
使用环糊精 (CD) 作为添加剂开发了芳香族化合物的区域选择性自由基 C-H 三氟甲基化。C-H三氟甲基化以高区域选择性进行,以良好的收率提供产品,即使是克级规模。在 CD 存在的情况下,一些底物选择性地进行单三氟甲基化,而在没有 CD 的情况下形成单三氟甲基化产物和双三氟甲基化产物的混合物。1 H NMR 实验表明区域选择性是通过在 CD 腔内包含基底来控制的。
The synthesis of aromatic ketones by chromium-catalyzed Kumada arylation of secondary amides with organomagnesium reagents is described. This reaction was enabled by using low-cost chromium(III) salt as a precatalyst, combined with trimethylsilyl chloride as an additive, and presents a rare example of catalytic transformation of secondary amides to ketones at room temperature. It was shown that catalytically