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
A Mild and General One-Pot Synthesis of Densely Functionalized Diaryliodonium Salts
作者:Linlin Qin、Bao Hu、Kiel D. Neumann、Ethan J. Linstad、Katelyenn McCauley、Jordan Veness、Jayson J. Kempinger、Stephen G. DiMagno
DOI:10.1002/ejoc.201500986
日期:2015.9
Diaryliodoniumsalts are powerful and widely used arylating agents in organic chemistry. Here we report a scalable, synthesis of densely functionalized diaryliodoniumsaltsfrom aryl iodides under mild conditions. This two-step, one-pot process has remarkable functional group tolerance, is compatible with commonly employed acid-labile protective group strategies, avoids heavy metal and transition metal
二芳基碘鎓盐是有机化学中强大且广泛使用的芳基化剂。在这里,我们报告了在温和条件下从芳基碘化物大规模合成密集官能化二芳基碘鎓盐的方法。这种两步一锅法具有显着的官能团耐受性,与常用的酸不稳定保护基策略兼容,避免重金属和过渡金属试剂,并为 PET 成像剂的稳定前体提供了直接途径。
Additive- and Photocatalyst-Free Borylation of Arylazo Sulfones under Visible Light
作者:Yuliang Xu、Xinying Yang、Hao Fang
DOI:10.1021/acs.joc.8b01662
日期:2018.10.19
developed a photocatalyst-free and additive-free, visible light induced borylation reaction using arylazo sulfones as starting material. This protocol shows some advantages such as mild conditions, simple equipment, and wide substrate scope, which gives a complementary protocol for the preparation of arylboronates.
Efficient metal-free photochemical borylation of aryl halides under batch and continuous-flow conditions
作者:Kai Chen、Shuai Zhang、Pei He、Pengfei Li
DOI:10.1039/c5sc04521e
日期:——
A rapid, chemoselective and metal-free C-B bond-forming reaction of aryl iodides and bromides in aqueous solution at low temperatures was discovered. This reaction is amenable to batch and continuous-flow conditions...
Transition-Metal-Free Borylation of Aryl Bromide Using a Simple Diboron Source
作者:Taeho Lim、Jeong Yup Ryoo、Min Su Han
DOI:10.1021/acs.joc.0c01065
日期:2020.8.21
reaction of aryl bromides. Bis-boronic acid (BBA), was used, and the borylation reaction was performed using a simple procedure at a mild temperature. Under mild conditions, aryl bromides were converted to arylboronic acids directly without any deprotection steps and purified by conversion to trifluoroborate salts. The functional group tolerance was considerably high. The mechanism study suggested that