Rapid Assessment of the Reaction‐Condition‐Based Sensitivity of Chemical Transformations
作者:Lena Pitzer、Felix Schäfers、Frank Glorius
DOI:10.1002/anie.201901935
日期:2019.6.17
clear overview of the sensitivity of reactions to key parameters is highly desirable. Herein, the development of such a method is described. The intuitive, standardized presentation of the results in a radar diagram enables the sensitivity of a protocol to be rapidly assessed. This method was applied to five different visible‐light‐mediated photochemical reactions, and the results were correlated to
Deaminative Borylation of Aliphatic Amines Enabled by Visible Light Excitation of an Electron Donor-Acceptor Complex
作者:Frederik Sandfort、Felix Strieth-Kalthoff、Felix J. R. Klauck、Michael J. James、Frank Glorius
DOI:10.1002/chem.201804246
日期:2018.11.22
strategy for the borylation of aliphatic primary amines is described. Alkyl radicals derived from the single‐electron reduction of redox‐active pyridinium salts, which can be isolated or generated in situ, were borylated in a visible light‐mediated reaction with bis(catecholato)diboron. No catalyst or further additives were required. The key electron donor–acceptor complex was characterized in detail
Synthesis of<i>ortho</i>-Acylbenzylboronates via Cross-Coupling Reaction of (Dialkoxyboryl)methylzinc Reagents with Haloarenes. A Stable<i>ortho</i>-Quinodimethane Precursor
作者:Gen Kanai、Norio Miyaura、Akira Suzuki
DOI:10.1246/cl.1993.845
日期:1993.5
cross-coupling reaction of IZnCH2B(OCMe2) with iodoarenes in the presence of PdCl2(PPh3)2 produces the corresponding benzylic boronates in high yields. Among them, the benzylic boronates having an acyl group at the ortho position readily undergo the 1,5-rearrangement to the carbonyl oxygen producing the o-quinodimethane derivatives under thermal or photochemical conditions. The reaction provides benzo-fused
Construction of α-Halogenated Boronic Esters via Visible Light-Induced C–H Bromination
作者:Feng-Chen Gao、Ming Li、Heng-Yu Gu、Xin-Yi Chen、Shuang Xu、Yi Wei、Kai Hong
DOI:10.1021/acs.joc.3c01915
日期:2023.10.6
α-Halogenated boronic esters are versatile building blocks that can be diversified into a wide variety of polyfunctionalized molecules. However, their synthetic potential has been hampered by limited preparation methods. Herein, we report a visible light-induced C–H brominationreaction of readily available benzyl boronic esters. This method features high yields, mild conditions, simple operation,
Development of the “Diverted Heck” Reaction for the Synthesis of Five-Membered Rings
作者:Kevin Breitwieser、Peter Chen
DOI:10.1021/acs.organomet.1c00025
日期:2021.3.22
The “diverted Heck” reaction has been shown to be a potent method to synthesize cyclopropanes from electron-rich olefins and iodomethyl trifluoroborate. Nevertheless, it is not mechanistically limited to the three-membered rings. The synthesis of five-membered rings using bifunctional substrates with a halide moiety and an organometallic group is described. Furthermore, the reactions of the respective