Electrophilic tetraalkylammonium nitrate nitration. I. Convenient new anhydrous nitronium triflate synthesis and in-situ heterocyclic N-nitration
作者:Christopher M. Adams、Clay M. Sharts、Scott A. Shackelford
DOI:10.1016/s0040-4039(00)61671-4
日期:1993.10
Reaction of tetra-n-butylammonium nitrate and triflicanhydride, CF3SO2OSO2CF3 (Tf2O), in dichloromethane (CH2Cl2) solvent at 0 degrees C, produces anhydrous nitronium nitrate, NO2OSO2CF3 (NO2OTf). Subsequent introduction of various heterocycles and their N-acetylated analogs yield N-nitrated products in 20–76% yield with an overall one-pot procedure.
硝酸四正丁基铵与三氟甲磺酸CF 3 SO 2 OSO 2 CF 3(Tf 2 O)在二氯甲烷(CH 2 Cl 2)溶剂中于0摄氏度下反应,生成无水硝酸硝氮,NO 2 OSO 2 CF 3(NO 2 OTf)。随后引入各种杂环及其N-乙酰化类似物,通过整体一锅法可得到20-76%的N-硝化产物。
<i>N</i>-Nitroheterocycles: Bench-Stable Organic Reagents for Catalytic <i>Ipso</i>-Nitration of Aryl- and Heteroarylboronic Acids
Photocatalytic and metal-free protocols to access various aromatic and heteroaromatic nitro compounds through ipso-nitration of readily available boronic acid derivatives were developed using non-metal-based, bench-stable, and recyclable nitrating reagents. These methods are operationally simple, mild, regioselective, and possess excellent functional group compatibility, delivering desired products
A Convenient Method For<i>N</i>-Nitration Using Ammonium Nitrate/Trifluoroacetic Anhydride
作者:Suresh Chander Suri、Robert D. Chapman
DOI:10.1055/s-1988-27696
日期:——
A mixture of ammonium nitrate and trifluoroacetic anhydride is found to be a convenient reagent for N-nitration in the synthesis of nitramines, nitramides, and nitrimides. Yields are comparable to those from conventional, but less convenient or safe, nitrating reagents.
convenient and transition metal free methodology for oxidative ipsonitration of diversely functionalized organoboronic acids, including heteroaryl- and alkylboronic acids, has been developed at ambient temperature using a combination of [bis-(trifluoroacetoxy)]iodobenzene (PIFA) – N-bromosuccinimide (NBS) and sodium nitrite as the nitro source. It is anticipated that the reaction proceeds through in
Catalytic <i>ipso</i>‐Nitration of Organosilanes Enabled by Electrophilic <i>N</i>‐Nitrosaccharin Reagent
作者:Ivan Mosiagin、Anthony J. Fernandes、Alena Budinská、Liana Hayriyan、Kai E. O. Ylijoki、Dmitry Katayev
DOI:10.1002/anie.202310851
日期:2023.10.9
Deploying N-nitrosaccharin reagents in combination with Lewis acid activation enables the facile, regio- and chemoselective nitration of (het)aryl silanes, allowing the introduction of nitro group under unprecedently mild conditions suitable for the late-stage nitration of complex and polyfunctionalized molecules. Theoretical and experimental mechanistic investigations formulate a plausible mechanism