Rhodium-Catalyzed Intermolecular C–H Silylation of Arenes with High Steric Regiocontrol
作者:Chen Cheng、John F. Hartwig
DOI:10.1126/science.1248042
日期:2014.2.21
has widespread applications in synthetic chemistry. The regioselectivity of these reactions is often controlled by directing groups or steric hindrance ortho to a potential reaction site. Here, we report a catalytic intermolecular C–H silylation of unactivated arenes that manifests very high regioselectivity through steric effects of substituents meta to a potential site of reactivity. The silyl moiety
C(sp<sup>2</sup>)–H Borylation of Fluorinated Arenes Using an Air-Stable Cobalt Precatalyst: Electronically Enhanced Site Selectivity Enables Synthetic Opportunities
作者:Jennifer V. Obligacion、Máté J. Bezdek、Paul J. Chirik
DOI:10.1021/jacs.6b13346
日期:2017.2.22
Cobalt catalysts with electronically enhanced site selectivity have been developed, as evidenced by the high ortho-to-fluorine selectivity observed in the C(sp2)-H borylation of fluorinated arenes. Both the air-sensitive cobalt(III) dihydride boryl 4-Me-(iPrPNP)Co(H)2BPin (1) and the air-stable cobalt(II) bis(pivalate) 4-Me-(iPrPNP)Co(O2CtBu)2 (2) compounds were effective and exhibited broad functional
Fluorine-controlled C–H borylation of fluoroarenes catalyzed by a PSiN–platinum complex.
氟控制的PSiN-铂配合物催化的氟芳烃C-H硼化反应。
Undirected ortho-selectivity in C–H borylation of arenes catalyzed by NHC platinum(0) complexes
作者:Sergey A. Rzhevskiy、Maxim A. Topchiy、Yulia D. Golenko、Pavel S. Gribanov、Grigorii K. Sterligov、Nikita Yu. Kirilenko、Alexandra A. Ageshina、Maxim V. Bermeshev、Mikhail S. Nechaev、Andrey F. Asachenko
DOI:10.1016/j.mencom.2020.09.005
日期:2020.9
Borylation of arenes with bis(pinacolato)diboron catalyzed by sterically encumbered NHC platinum complexes proceeds predominantly at ortho-position even in the absence of a directing group (o : m : p ratio up to 10: 3: 1). The similar borylation with pinacolborane would proceed less selectively.
<scp>Iron‐Catalysed</scp>
C(sp
<sup>2</sup>
)‐H Borylation with Expanded Functional Group Tolerance
<sup>†</sup>
作者:Luke Britton、Jamie H. Docherty、Gary S. Nichol、Andrew P. Dominey、Stephen P. Thomas
DOI:10.1002/cjoc.202200465
日期:2022.12.15
efficient access to aryl boronic esters. Using in situ catalyst activation and photoirradiation, the iron-catalysed C(sp2)-H borylation reaction of carboarenes, pyrroles, and indoles has been developed using only bench-stable pre-catalysts and reagents. Good functional group tolerance was observed including those not reported using previous methods (ArNH2, ArOH, ArSiR3, ArP(O)(OR)2, ArC(O)NR2). Mechanistic