Journal of Chemical Research,
Journal Year:
2020,
Volume and Issue:
45(5-6), P. 365 - 373
Published: July 17, 2020
Organosulfur
compounds
with
unsymmetrical
S–S
bonds
are
usually
called
disulfides
and
widely
used
in
the
biological,
medicinal,
chemical
fields.
Their
versatility
has
guided
development
of
various
new
methods
for
synthesis
disulfides.
In
recent
years,
by
cross-dehydrogenation
thiols
attracted
much
attention
due
to
its
high
atomic
economy.
Herein,
this
review
summarizes
progress
toward
under
oxidation,
electrooxidation,
or
photocatalysis
thiols.
Green Chemistry,
Journal Year:
2020,
Volume and Issue:
22(6), P. 1906 - 1910
Published: Jan. 1, 2020
A
metal-free
route
to
alkynyl
sulfones
under
photoinduced
conditions
is
accomplished,
starting
from
4-alkyl
Hantzsch
esters,
sulfur
dioxide,
and
bromides
visible
light
irradiation
at
room
temperature.
Organic & Biomolecular Chemistry,
Journal Year:
2020,
Volume and Issue:
18(8), P. 1504 - 1521
Published: Jan. 1, 2020
Recent
advances
in
the
direct
β-C(sp2)–H
functionalization
of
enamides,
mainly
including
arylation,
alkenylation,
alkynylation,
alkylation,
acylation,
sulfonylation,
phosphorylation,
and
others,
are
reported.
Chemical Communications,
Journal Year:
2020,
Volume and Issue:
56(21), P. 3225 - 3228
Published: Jan. 1, 2020
A
copper-catalyzed
reaction
of
O-acyl
oximes,
DABCO·(SO2)2,
and
2H-azirines
is
developed
under
mild
conditions,
leading
to
diverse
tetrasubstituted
β-sulfonyl
N-unprotected
enamines
with
excellent
stereoselectivity
regioselectivity.
Chemical Communications,
Journal Year:
2020,
Volume and Issue:
56(23), P. 3437 - 3440
Published: Jan. 1, 2020
A
three-component
reaction
of
arylboronic
acids,
nitroarenes,
and
potassium
metabisulfite
under
copper
catalysis
proceeds
smoothly,
giving
rise
to
a
range
sulfonamides
in
good
excellent
yields
with
broad
substrate
scope.
Organic Chemistry Frontiers,
Journal Year:
2020,
Volume and Issue:
7(7), P. 938 - 943
Published: Jan. 1, 2020
A
photoinduced
reaction
of
potassium
alkyltrifluoroborates,
sodium
metabisulfite,
and
alkynyl
bromides
under
visible
light
irradiation
at
room
temperature
is
developed.
Chinese Journal of Chemistry,
Journal Year:
2020,
Volume and Issue:
38(4), P. 361 - 366
Published: Jan. 17, 2020
Summary
of
main
observation
and
conclusion
Sulfonylation
alkenes
through
photoredox‐catalyzed
functionalization
with
thiourea
dioxide
under
visible‐light
irradiation
is
achieved.
The
reaction
alkenes,
electrophiles
provides
a
green
efficient
access
to
alkyl
sulfones
sulfonamides.
A
broad
scope
presented
good
functional
group
compatibility
excellent
regioselectivity.
plausible
mechanism
involving
radical
addition
process
sulfur
anion
(SO
2
‐
)
derived
from
the
oxidation
2–
proposed,
which
supported
by
fluorescence
quenching
experiments.
The Journal of Organic Chemistry,
Journal Year:
2020,
Volume and Issue:
85(10), P. 6498 - 6508
Published: April 24, 2020
An
alternative
process
of
Pd-catalyzed
C-4
selective
coupling
2,4-dichloropyridines
with
boronic
esters
was
developed,
which
afforded
24
examples
coupled
pyridines
in
moderate
to
good
yields.
After
further
arylation,
21
C-2,
diarylated
a
significant
photophysical
property
were
obtained,
applied
as
pyridine-based
dyes
into
live-cell
imaging
biocompatibility
and
low
toxicity.
Chemical Communications,
Journal Year:
2020,
Volume and Issue:
56(17), P. 2554 - 2557
Published: Jan. 1, 2020
Metal-free
insertion
of
sulfur
dioxide
with
aryl/alkyl
iodides
and
3-azido-2-methylbut-3-en-2-ol
under
ultraviolet
irradiation
at
room
temperature
is
achieved,
giving
rise
to
2-sulfonylacetonitriles
in
moderate
good
yields.
Organic Chemistry Frontiers,
Journal Year:
2021,
Volume and Issue:
8(13), P. 3543 - 3593
Published: Jan. 1, 2021
This
review
gives
an
insight
into
the
most
recent
synthetic
methodologies
towards
spiro-γ-lactams,
a
class
of
compounds
that
are
present
in
wide
range
bioactive
and
naturally
occurring
molecules.
The Journal of Organic Chemistry,
Journal Year:
2021,
Volume and Issue:
86(20), P. 14016 - 14027
Published: March 22, 2021
A
new
method
was
developed
for
the
synthesis
of
4-chalcogenyl-1H-isochromen-1-ones
through
6-endo-dig
electrophilic
cyclization
2-alkynylaryl
esters
and
diorganyl
dichalcogenides
under
ultrasound
irradiation.
The
reactions
were
performed
mild
conditions,
using
Oxone
as
a
green
oxidant
to
promote
cleavage
chalcogen–chalcogen
bond
in
diselenides
ditellurides
generate
species
situ.
total
25
compounds
selectively
obtained
after
30–70
min,
good
excellent
yields
(74–95%).
This
procedure
extended
prepare
5H-selenopheno[3,2-c]isochromen-5-ones.
Additionally,
first
time,
used
substrates
thionation
reaction,
Lawesson's
reagent
microwave
irradiation
solvent-free
obtaining
thio
derivatives
up
99%
only
15
min.
