Aminoazanium of DABCO: An Amination Reagent for Alkyl and Aryl Pinacol Boronates
作者:Xingxing Liu、Qing Zhu、Du Chen、Lu Wang、Liqun Jin、Chao Liu
DOI:10.1002/anie.201913388
日期:2020.2.10
The aminoazanium of DABCO (H2 N-DABCO) has been developed as a general and practical amination reagent for the direct amination of alkyl and aryl pinacolboronates. This compound is stable and practical for use as a reagent. Various primary, secondary. and tertiary alkyl-Bpin and aryl-Bpin substrates were aminated to give the corresponding amine derivatives. The amination is stereospecific. The anti-Markovnikov
Chemoselective Hydroxylation of Aliphatic sp<sup>3</sup> C–H Bonds Using a Ketone Catalyst and Aqueous H<sub>2</sub>O<sub>2</sub>
作者:Conor J. Pierce、Michael K. Hilinski
DOI:10.1021/ol503410e
日期:2014.12.19
The first ketone-catalyzed method for the oxidation of aliphatic C–H bonds is reported. The reaction conditions employ aryl trifluoromethyl ketones in catalytic amounts and hydrogen peroxide as the terminal oxidant. Hydroxylation is stereospecific and chemoselective for tertiary over secondary C–H bonds. A catalytic cycle invoking a dioxirane as the active oxidant is proposed.
Trifluoromethylation of heterocumulenes with trimethyl(trifluoromethyl)silane in the presence of fluoride ions: synthesis of trifluoroacetamides and trifluorothioacetamides from isocyanates and isothiocyanates
作者:Nataliya V Kirij、Yurii L Yagupolskii、Nataliya V Petukh、Wieland Tyrra、Dieter Naumann
DOI:10.1016/s0040-4039(01)01764-6
日期:2001.11
Trimethyl(trifluoromethyl)silane reacts in the presence of fluoride ions with isocyanates and isothiocyanates under mild conditions to give corresponding trifluoroacetamides and trifluorothioacetamides in high yields.
Mechanochemical Defluorinative Arylation of Trifluoroacetamides: An Entry to Aromatic Amides
作者:Satenik Mkrtchyan、Mohanad Shkoor、Mandalaparthi Phanindrudu、Miroslav Medved′、Olena Sevastyanova、Viktor O. Iaroshenko
DOI:10.1021/acs.joc.2c02197
日期:2023.1.20
salts, or dimethyl(phenyl)sulfonium salts with trifluoroacetamides affords substituted aromatic amides in good to excellent yields. These nickel-catalyzedreactions are enabled by C–CF3 bond activation using Dy2O3 as an additive. The current protocol provides versatile and scalable routes for accessing a wide variety of substituted aromatic amides. Moreover, the protocol described in this work overcomes
酰胺键在天然和合成有机分子中很突出,在各个领域都具有活性。在众多的酰胺合成方法中,取代预先存在的 (O)C-N 部分是一种尚未开发的酰胺合成策略。在这项工作中,我们公开了一种用于脂肪族和芳香族三氟乙酰胺脱氟芳基化产生芳香族酰胺的新方案。芳基硼酸、三甲氧基苯基硅烷、二芳基碘盐或二甲基(苯基)锍盐与三氟乙酰胺的机械化学诱导反应以良好至极好的收率提供取代的芳族酰胺。这些镍催化的反应是通过使用 Dy 2 O 3的 C–CF 3键活化来实现的作为添加剂。当前的协议提供了通用且可扩展的路线,用于访问各种取代的芳香酰胺。此外,这项工作中描述的协议克服了先前报告的方法中的缺点和局限性。
VIGORITA M. G.; FICARRA R.; FICARRA P.; TOMASSINI A., BOLL. CHIM. FARM., 1981, 120, NO 5, 278-285
作者:VIGORITA M. G.、 FICARRA R.、 FICARRA P.、 TOMASSINI A.