Expanding the Balz-Schiemann Reaction: Organotrifluoroborates Serve as Competent Sources of Fluoride Ion for Fluoro-Dediazoniation
作者:Tharwat Mohy El Dine、Omar Sadek、Emmanuel Gras、David M. Perrin
DOI:10.1002/chem.201803575
日期:2018.10.9
The Balz–Schiemann reaction endures as a method for the preparation of (hetero)aryl fluorides yet is eschewed due to the need for harsh conditions or high temperatures along with the need to isolate potentially explosive diazonium salts. In a departure from these conditions, we show that various organotrifluoroborates (RBF3−s) may serve as fluorideion sources for solution‐phase fluoro‐dediazoniation
Copper(II)-Catalyzed Conversion of Aryl/Heteroaryl Boronic Acids, Boronates, and Trifluoroborates into the Corresponding Azides: Substrate Scope and Limitations
作者:Courtney Aldrich、Kimberly Grimes、Amol Gupte
DOI:10.1055/s-0029-1218683
日期:2010.5
incorporating B-C(sp³) bonds are unreactive under the reaction conditions. The copper(II)-catalyzed boronic acid-azide coupling reaction is further extended to both boronate esters and potassium organotrifluoroborate salts. The method described herein complements existing procedures for the preparation of arylazides from the respective amino, triazene, and halide derivatives and we expect that it will greatly
我们报告了铜 (II) 催化的有机硼化合物转化为相应的叠氮化物衍生物。评估了一系列系统的苯基硼酸衍生物,以检查取代基的空间和电子效应对反应产率以及官能团兼容性的重要性。杂环底物也被证明参与了这种温和的反应,而结合了 BC( sp³) 键在反应条件下不反应。铜 (II) 催化的硼酸-叠氮化物偶联反应进一步扩展到硼酸酯和有机三氟硼酸钾盐。本文描述的方法补充了从各自的氨基、三氮烯和卤化物衍生物制备芳基叠氮化物的现有程序,我们预计它将极大地促进铜和钌催化的叠氮化物-炔环加成反应,以制备多种功能化的 1-芳基-或1-杂芳基-1,2,3-三唑衍生物。 叠氮化物 - 有机硼化合物 - 铜催化 - 1,2,3-三唑
Sustainable oxidations with air mediated by gallic acid: potential applicability in the reutilization of grape pomace
作者:Jimena Scoccia、Marcelle D. Perretti、Diego M. Monzón、Fernando P. Crisóstomo、Víctor S. Martín、Romen Carrillo
DOI:10.1039/c5gc02966j
日期:——
Tannins like gallicacid and even grape pomace extract are able to perform oxidations with air thus unleashing an alternative method for reutilization and valorization of bio-wastes.
withstanding ozonolysis of remote alkenes, thus providing a new route to oxo-substituted organotrifluoroborates. The primary ozonides initially generated upon ozonolysis can be reduced with Zn/AcOH to afford the carbonyl compounds. Alternatively, capture of the carbonyl oxides with either an appropriate N-oxide or H2O easily gives the desired oxo-substituted organotrifluoroborates. Both unsaturated alkyltrifluoroborates
Acid-promoted metal-free protodeboronation of arylboronic acids
作者:Guoqing Zhang、Yang Li、Jianhui Liu
DOI:10.1039/c7ra05979e
日期:——
protodeboronation of arylboronicacids in the absence of metal catalysts or any other additives is described. This protodeboronation is general for a range of arylboronicacids with both electron-donating and electron-withdrawing groups in good to excellent yields under air atmosphere. Density functional theory mechanistic studies showed that the protodeboronation of arylboronicacids followed an intermolecular