The Journal of Organic Chemistry,
Год журнала:
2023,
Номер
88(13), С. 8055 - 8068
Опубликована: Июнь 13, 2023
We
describe
a
one-pot
strategy
to
access
3-carboxyl-
and
3-ketopyridines
from
readily
available
alkynes
propargylamine
via
hydroamination
process.
This
protocol
uses
as
starting
materials,
has
broad
substrate
scope,
operates
in
aqueous
media
open-air
conditions.
A
series
of
aryl-
alkyl-substituted
pyridines
were
synthesized.
green
methodology
can
be
scaled
laboratory
size
was
used
for
the
synthesis
natural
product
core,
4-aza-fluorenone.
Density-functional
theory
control
mechanistic
studies
support
domino
hydroamination/pericyclic
reaction,
which
includes
formation
enaminone
intermediate
its
transformation
through
an
aza-Claisen
rearrangement
desired
pyridine
product.
RSC Advances,
Год журнала:
2022,
Номер
12(40), С. 26023 - 26041
Опубликована: Янв. 1, 2022
Herein,
we
delignated
the
synthesis
of
a
novel
inorganic
sulfurous
magnetic
solid
acid
catalyst
by
immobilization
an
extremely
high
content
sulfuric
functionalities
on
amorphous
silica-modified
hercynite
nanomagnetic
core-shell
via
simple
method.
Silica
(SSA)
modified
nanocomposite
(hercynite@SSA)
combines
excellent
recoverability
and
stability
characteristics
(which
can
be
regarded
as
ferro
spinel
with
Fd3m
space
group
cubic
crystal
structure)
strong
Brønsted
properties
-SO3H
groups.
This
was
found
to
efficient
facile
for
bis(pyrazolyl)methanes
two
different
one-pot
multicomponent
methodologies
under
green
conditions.
The
hercynite@SSA
shows
catalytic
activity
reusability
in
ethanolic
medium
among
materials.
A
plausible
reaction
mechanism
is
proposed
this
synthesis.
ACS Applied Nano Materials,
Год журнала:
2023,
Номер
7(1), С. 1265 - 1277
Опубликована: Дек. 22, 2023
Herein,
the
l-serine-functionalized
metal–organic
framework
nanostructure
is
obtained
via
a
simple
two-step
post-synthetic
modification
strategy.
Interesting
properties
of
serine,
such
as
existence
both
acidic
and
basic
groups,
provide
amphoteric
active
sites
on
UiO-66-NH2
that
are
not
accessible
through
direct
synthesis.
In
this
sense,
an
excess
amount
1,6
hexamethylene
diisocyanate
primarily
used
linker
to
allow
conversion
nucleophilic
groups
in
isocyanate
suitable
electrophile
group.
l-serine
reacted
with
generate
corresponding
urea
derivative.
SEM,
TEM,
nitrogen
adsorption
analyses
confirm
average
particle
size
approximately
24
nm
pore
6.68
within
framework.
Notably,
synthesized
nanomaterial
exhibited
high
catalytic
activity,
stability,
durability
solvent-free
procedures
synthesizing
diverse
range
4H-pyrano[2,3-b]
pyridine-3,6-dicarbonitriles
octahydropyrimido
[4,5
b][1,8]naphthyridine-7-carbonitriles.
Moreover,
catalyst
was
easily
separated─indicating
substantial
decrease
activity
upon
five
consecutive
runs
reaction.
Inorganic Chemistry Frontiers,
Год журнала:
2023,
Номер
10(14), С. 3995 - 4007
Опубликована: Янв. 1, 2023
Atomically
precise
nanoclusters
provide
a
good
platform
for
investigating
the
actual
active
sites
and
reaction
mechanisms
of
electrocatalysis
at
atomic
or
molecular
scale,
which
has
been
investigated
numerous
electrocatalytic
applications.
Langmuir,
Год журнала:
2023,
Номер
39(6), С. 2408 - 2421
Опубликована: Фев. 1, 2023
Stimuli-responsive
hybrid
nanoparticles
used
for
controllable
catalysis
have
been
attracting
increasing
attention.
This
study
aims
to
prepare
microgels
with
excellent
temperature-sensitive
colorimetric
and
catalytic
properties
through
combining
the
surface
plasmon
resonance
of
gold
(AuNPs)
poly(N-isopropylacrylamide)
(PNIPAM)-based
microgels.
Microgels
hydroxy
groups
(MG-OH)
were
prepared
by
soap-free
emulsion
polymerization,
using
N-isopropylacrylamide
as
main
monomer,
hydroxyethyl
methylacrylate
functional
N,N′-methylene
bisacrylamide
crosslinker,
2,2′-azobis(2-methylpropionamidine)
dihydrochloride
an
initiator
ensure
are
positively
charged.
Furthermore,
chemical
modification
on
MG-OH
was
carried
out
3-mercaptopropyltriethoxysilane
obtain
thiolated
(MG-SH).
Two
kinds
nanoparticles,
AuNPs@MG-OH
AuNPs@MG-SH,
self-assembled,
electrostatic
interaction
between
positive
negative
citrate-stabilized
AuNPs
well
synergistic
bonding
Au–S
MG-SH
AuNPs.
The
morphology,
stability,
properties,
systematically
investigated.
Results
showed
that
although
both
AuNPs@MG-SH
exhibit
good
reduction
reaction
p-nitrophenol,
has
better
stability
higher
performance
than
AuNPs@MG-OH.
work
competitiveness
against
known
PNIPAM-based
materials
may
provide
effective
method
preparing
smart
catalysts
self-assembly
stimuli-responsive
polymers,
which
a
great
potential
application
catalyzing
variety
reactions.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2022,
Номер
10(14), С. 4359 - 4373
Опубликована: Март 31, 2022
With
increasing
ecological
and
environmental
concerns
because
of
the
extensive
use
petroleum-based
products,
natural
resources
for
preparation
functional
materials
is
great
public
value.
Cellulose
introduced
as
an
ideal
promising
biomaterial
widespread
application
which
obtained
from
biobased
sources
such
plants,
biomass,
or
bacteria,
relying
on
efficient,
scalable,
facile
methods.
Generally,
sulfation,
silylation,
esterification,
phosphorylation,
etherification,
oxidation
are
common
reactions
that
were
applied
functionalization
cellulose;
however,
multicomponent
(MCRs),
surmised
versatile
assorted
approaches,
have
been
deployed
modification
cellulose.
The
functionalized
celluloses
enjoyed
various
unique
phenomena
properties
render
them
biomaterials
applications
ranging
biomedicine
to
catalysis.
Herein,
diverse
types
prominent
MCRs
encompassing
Biginelli,
Hantzsch,
Kabachnik–Fields,
Betti,
well
two
paramount
isocyanide-based
MCRs,
namely,
Passerini
Ugi,
used
in
cellulose
functionalization.
emerged
significant
platforms
generate
cellulose-based
with
new
properties,
reviewed
here
special
emphasis
modification,
functionalization,
cutting-edge
drug
delivery,
catalysis,
C–H
reaction,
emulsifier,
among
others.
