meta-Selective C–H Borylation of Benzamides and Pyridines by an Iridium–Lewis Acid Bifunctional Catalyst
作者:Lichen Yang、Nao Uemura、Yoshiaki Nakao
DOI:10.1021/jacs.9b03138
日期:2019.5.15
We report herein the iridium-catalyzed meta-selective C-H borylation of benzamides by using a newly designed 2,2'-bipyridine (bpy) ligand bearing an alkylaluminum biphenoxide moiety. We also demonstrate the iridium-catalyzed C3-selective C-H borylation of pyridine with a 1,10-phenanthroline (Phen) ligand bearing an alkylborane moiety. It is proposed that the Lewisacid-base interaction between the
<i>para</i>
‐Selective C−H Borylation of (Hetero)Arenes by Cooperative Iridium/Aluminum Catalysis
作者:Lichen Yang、Kazuhiko Semba、Yoshiaki Nakao
DOI:10.1002/anie.201701238
日期:2017.4.18
para‐SelectiveC−H borylation of benzamides and pyridines has been achieved by cooperative iridium/aluminum catalysis. A combination of iridium catalysts commonly employed for arene C−H borylation and bulky aluminum‐based Lewis acid catalysts provides an unprecedented strategy for controlling the regioselectivity of C−H borylation to give variously substituted (hetero)arylboronates, which are versatile
herein a supramolecular catalyst harnessing Zn⋅⋅⋅N interactions that binds to pyridine-like substrates as tight as it can be found in some enzymes. The distance and spatial geometry between the active site and the substrate binding site is ideal to target unprecedented meta-selective iridium-catalyzed C−Hbondborylations with enzymatic Michaelis–Menten kinetics, besides unique substrate selectivity and
ELECTRON-TRANSPORTING MATERIALS AND PROCESSES FOR MAKING THE SAME
申请人:Chichak Kelly Scott
公开号:US20100174086A1
公开(公告)日:2010-07-08
Compound of formula C is made by reacting a compound of formula A with an pyridyl boronic acid or pyridyl borate ester to form a compound of formula B; and
combining the compound of formula B with a pyridyl dihalide to form the compound of C;
wherein
R
3
, R
4
, R
5
, R
6
and R
7
are, independently at each occurrence, a C
1
-C
20
aliphatic radical, a C
3
-C
20
aromatic radical, or a C
3
-C
20
cycloaliphatic radical;
X is, independently at each occurrence, CH or N;
Y is chloro or bromo;
Z is bromo or iodo; and when Y is bromo, Z is iodo;
d, e, and g are, independently at each occurrence, an integer ranging from 0-4;
f is an integer ranging from 0-2; and
h is an integer ranging from 0-3.
[EN] 2,4,6-TRI-(HETEROARYLPHENYL)-PYRIDINES AND ELECTRON-TRANSPORTING MATERIALS COMPRISING THEM<br/>[FR] 2,4,6-TRI(HÉTÉROARYLPHÉNYL)PYRIDINES ET MATÉRIAUX DE TRANSPORT D'ÉLECTRONS LES COMPRENANT
申请人:GEN ELECTRIC
公开号:WO2010080471A1
公开(公告)日:2010-07-15
Compounds of formula 1 may be used in optoelectronic devices wherein R1 and R2 are, independently at each occurrence, H, a C1-C20 aliphatic radical, a C3-C20 aromatic radical, or a C3-C20 cyeioaiiphatic radical; a is an integer ranging from 0-2; b is 1 or 2; c is an integer ranging from 0-4; and Ar1 and Ar2; are independently heteroaryl.