“…13 C NMR (500 MHz, CDCl 3 , 300 K), δ (ppm): 137.51, 134.1, 132.47, 132.05, 128.99, 128.67, 127.85, 127.57, 127.36, 127.29, 126.76, 126.60, 126.35, 125.87, 39.09. NMR data are consistent with the reported literature …”
Section: Methodssupporting
confidence: 92%
“…ESI-MS m/z [M + H] + = 301.0103 (calculated for C 20 H 28 S, 301.0089). 1 52 4-(Phenylthio)pyridine (CD6). Silica gel column chromatography having eluent as n-hexane and ethyl acetate of 10:1 (v/v).…”
The
usefulness of transition metal catalytic systems in C–S
cross-coupling reactions is significantly reduced by air and moisture
sensitivity, as well as harsh reaction conditions. Herein, we report
four highly air- and moisture-stable well-defined mononuclear and
bridged dinuclear α-diimine Ni(II) and Pd(II) complexes for
C–S cross-coupling. Various ligand frameworks, including acenaphthene-
and iminopyridine-based ligands, were employed, and the resulting
steric properties of the catalysts were evaluated and correlated with
reaction outcomes. Under aerobic conditions and low temperatures,
both Ni and Pd systems exhibited broader substrate scope and functional
group tolerance than previously reported catalysts. Over 40 compounds
were synthesized from thiols containing alkyl, benzyl, and heteroaryl
groups. Also, pharmaceutically active heteroaryl moieties are incorporated
from thiol and halide sources. Notably, the bridged dinuclear five-coordinate
Ni complex has outperformed the remaining three mono four- or six-coordinate
complexes by giving almost quantitative yields across a broad substrate
scope.
“…13 C NMR (500 MHz, CDCl 3 , 300 K), δ (ppm): 137.51, 134.1, 132.47, 132.05, 128.99, 128.67, 127.85, 127.57, 127.36, 127.29, 126.76, 126.60, 126.35, 125.87, 39.09. NMR data are consistent with the reported literature …”
Section: Methodssupporting
confidence: 92%
“…ESI-MS m/z [M + H] + = 301.0103 (calculated for C 20 H 28 S, 301.0089). 1 52 4-(Phenylthio)pyridine (CD6). Silica gel column chromatography having eluent as n-hexane and ethyl acetate of 10:1 (v/v).…”
The
usefulness of transition metal catalytic systems in C–S
cross-coupling reactions is significantly reduced by air and moisture
sensitivity, as well as harsh reaction conditions. Herein, we report
four highly air- and moisture-stable well-defined mononuclear and
bridged dinuclear α-diimine Ni(II) and Pd(II) complexes for
C–S cross-coupling. Various ligand frameworks, including acenaphthene-
and iminopyridine-based ligands, were employed, and the resulting
steric properties of the catalysts were evaluated and correlated with
reaction outcomes. Under aerobic conditions and low temperatures,
both Ni and Pd systems exhibited broader substrate scope and functional
group tolerance than previously reported catalysts. Over 40 compounds
were synthesized from thiols containing alkyl, benzyl, and heteroaryl
groups. Also, pharmaceutically active heteroaryl moieties are incorporated
from thiol and halide sources. Notably, the bridged dinuclear five-coordinate
Ni complex has outperformed the remaining three mono four- or six-coordinate
complexes by giving almost quantitative yields across a broad substrate
scope.
“…p-methoxybenzyl thiol 43 (4j): The aqueous layer on acidified with concentrated HCl to pH=2, then extract with ether (25 mL X 2), wash the ether layer with water (50 mL), brine solution (50 mL), dried over MgSO4 and filter. The filtrate was concentrated to give thiol 4i as residual…”
<div>Synthesis of unsymmetrical trithiocarbonate sulfonate salt, along with disulfide, thiol and</div><div>symmetrical trithiocarbonate from 3-mercapto-1-propane-sulfonicacid, sodium salt with, without</div><div>of phase transfer catalyst and under various reaction conditions are described. The obtained</div><div>compounds having divergent usefulness in RAFT polymerization, sulfonyl preparation and</div><div>having capable of binding in a multidentate fashion to soft transition metal ions.</div>
“… 93 In the following years, we prepared cobalt–molybdenum sulfides (Co–Mo–S) with tunable phase composition that displayed enhanced catalytic activity for the chemo- and regioselective hydrogenation of quinoline derivatives 94 and for the borrowing hydrogen synthesis of thioethers from alcohols. 95 Later on, bimetallic iron molybdenum selenides were applied as catalysts for the preparation of pyrrolo[1,2- a ]quinoxalines from o -nitroanilines. 96 …”
Developing more sustainable
catalytic processes for preparing N-heterocyclic
compounds in a less costly, compact, and greener manner from cheap
and readily available reagents is highly desirable in modern synthetic
chemistry. Herein, we report a straightforward synthesis of benzimidazoles
by reductive coupling of
o
-dinitroarenes with aldehydes
in the presence of molecular hydrogen. An innovative molecular cluster-based
synthetic strategy that employs Mo
3
S
4
complexes
as precursors have been used to engineer a sulfur-deficient molybdenum
disulfide (MoS
2
)-type material displaying structural defects
on both the naturally occurring edge positions and along the typically
inactive basal planes. By applying this catalyst, a broad range of
functionalized 2-substituted benzimidazoles, including bioactive compounds,
can be selectively synthesized by such a direct hydrogenative coupling
protocol even in the presence of hydrogenation-sensitive functional
groups, such as double and triple carbon–carbon bonds, nitrile
and ester groups, and halogens as well as diverse types of heteroarenes.
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