Organic Letters,
Journal Year:
2018,
Volume and Issue:
20(10), P. 3049 - 3052
Published: May 2, 2018
A
selective
oxy-alkylation
of
allylamines
with
unactivated
alkyl
bromides
and
CO2
via
visible-light-driven
palladium
catalysis
is
reported.
The
commercially
available
Pd(PPh3)4
used
as
the
sole
catalyst
in
this
three-component
reaction.
variety
tertiary,
secondary,
primary
undergo
reactions
to
generate
important
2-oxazolidinones
high
yields
selectivity.
mild
reaction
conditions,
easy
scalability,
facile
derivatization
products
provide
great
potential
for
application
organic
synthesis
pharmaceutical
chemistry.
Chemical Reviews,
Journal Year:
2021,
Volume and Issue:
122(2), P. 1543 - 1625
Published: Oct. 8, 2021
In
recent
years,
visible
light-induced
transition
metal
catalysis
has
emerged
as
a
new
paradigm
in
organic
photocatalysis,
which
led
to
the
discovery
of
unprecedented
transformations
well
improvement
known
reactions.
this
subfield
complex
serves
double
duty
by
harvesting
photon
energy
and
then
enabling
bond
forming/breaking
events
mostly
via
single
catalytic
cycle,
thus
contrasting
established
dual
photocatalysis
an
exogenous
photosensitizer
is
employed.
addition,
approach
often
synergistically
combines
catalyst–substrate
interaction
with
photoinduced
process,
feature
that
uncommon
conventional
photoredox
chemistry.
This
Review
describes
early
development
advances
emerging
field.
Chemical Reviews,
Journal Year:
2020,
Volume and Issue:
120(17), P. 9790 - 9833
Published: Aug. 6, 2020
Alkyl
radicals
are
key
intermediates
in
organic
synthesis.
Their
classic
generation
from
alkyl
halides
has
a
severe
drawback
due
to
the
employment
of
toxic
tin
hydrides
point
that
"flight
tyranny
tin"
radical
processes
was
considered
for
long
time
an
unavoidable
issue.
This
review
summarizes
main
alternative
approaches
unstabilized
radicals,
using
photons
as
traceless
promoters.
The
recent
development
photochemical
and
photocatalyzed
enabled
discovery
plethora
new
precursors,
opening
world
chemistry
broader
community,
thus
allowing
era
photon
democracy.
Chemical Reviews,
Journal Year:
2021,
Volume and Issue:
122(2), P. 2017 - 2291
Published: Nov. 23, 2021
We
present
here
a
review
of
the
photochemical
and
electrochemical
applications
multi-site
proton-coupled
electron
transfer
(MS-PCET)
in
organic
synthesis.
MS-PCETs
are
redox
mechanisms
which
both
an
proton
exchanged
together,
often
concerted
elementary
step.
As
such,
MS-PCET
can
function
as
non-classical
mechanism
for
homolytic
bond
activation,
providing
opportunities
to
generate
synthetically
useful
free
radical
intermediates
directly
from
wide
variety
common
functional
groups.
introduction
practitioner’s
guide
reaction
design,
with
emphasis
on
unique
energetic
selectivity
features
that
characteristic
this
class.
then
chapters
oxidative
N–H,
O–H,
S–H,
C–H
homolysis
methods,
generation
corresponding
neutral
species.
Then,
reductive
PCET
activations
involving
carbonyl,
imine,
other
X═Y
π-systems,
heteroarenes,
where
ketyl,
α-amino,
heteroarene-derived
radicals
be
generated.
Finally,
we
asymmetric
catalysis
materials
device
applications.
Within
each
chapter,
subdivide
by
group
undergoing
homolysis,
thereafter
type
transformation
being
promoted.
Methods
published
prior
end
December
2020
presented.
ACS Catalysis,
Journal Year:
2020,
Volume and Issue:
10(16), P. 9170 - 9196
Published: July 20, 2020
The
development
of
transition
metal
(TM)
catalysis
for
organic
synthesis
under
visible
light
without
recourse
to
typical
photoredox
catalysts
has
become
a
rapidly
growing
area
research
and
been
actively
explored
in
the
past
several
years.
Distinct
from
extensively
developed
catalysis,
which
photocatalyst
generally
does
not
directly
participate
bond-forming
process,
photocatalyst/TM
synergistic
absorbs
photon
energy
transfers
TM
catalyst
through
redox
or
transfer
this
Review
focuses
on
summarizing
recent
developments
photocatalytic
reactions
that
use
complexes
both
absorb
catalytic
bond
formation
involving
covalently
bonded
intermediate.
contents
are
categorized
by
used
(Pd,
Cu,
Co,
Ni,
Mn,
Au,
Rh,
Fe,
Ru),
with
descending
sequence
according
number
examples
reported
each
metal,
provide
an
overview
April
2020.
Future
perspectives
personal
opinions
regarding
expanding
field
also
discussed.
Accounts of Chemical Research,
Journal Year:
2021,
Volume and Issue:
54(10), P. 2518 - 2531
Published: May 6, 2021
ConspectusCarbon
dioxide
(CO2)
is
not
only
a
greenhouse
gas
and
common
waste
product
but
also
an
inexpensive,
readily
available,
renewable
carbon
resource.
It
important
one-carbon
(C1)
building
block
in
organic
synthesis
for
the
construction
of
valuable
compounds.
However,
its
utilization
challenging
owing
to
thermodynamic
stability
kinetic
inertness.
Although
significant
progress
has
been
achieved,
many
limitations
remain
this
field
with
regard
substrate
scope,
reaction
system,
activation
strategies.Since
2015,
our
group
focused
on
CO2
synthesis.
We
are
interested
vast
possibilities
radical
chemistry,
although
high
reactivity
radicals
presents
challenges
controlling
selectivity.
hope
develop
highly
useful
transformations
involving
by
achieving
balance
selectivity
under
mild
conditions.
Over
past
6
years,
we
along
other
experts
have
disclosed
radical-type
carboxylative
cyclizations
carboxylations
using
CO2.We
initiated
research
realizing
Cu-catalyzed
oxytrifluoromethylation
allylamines
heteroaryl
methylamines
generate
2-oxazolidones
various
precursors.
Apart
from
Cu
catalysis,
visible-light
photoredox
catalysis
powerful
method
achieve
efficient
cyclization.
In
these
cases,
single-electron-oxidation-promoted
C–O
bond
formation
between
benzylic
carbamates
key
step.Since
carboxylic
acids
exist
widely
natural
products
bioactive
drugs
serve
as
bulk
chemicals
industry,
realized
further
visible-light-promoted
construct
such
chemicals.
achieved
selective
umpolung
imines,
enamides,
tetraalkylammonium
salts,
oxime
esters
successive
single-electron-transfer
(SSET)
reduction.
Using
strategy,
dearomative
arylcarboxylation
indoles
CO2.
addition
incorporation
1
equiv
per
substrate,
recently
developed
photoredox-catalyzed
dicarboxylation
alkenes,
allenes,
(hetero)arenes
via
SSET
reduction,
which
allows
two
molecules
into
compounds
diacids
polymer
precursors.In
two-electron
CO2,
sought
new
strategies
realize
single-electron
Inspired
hypothetical
electron-transfer
mechanism
iron–sulfur
proteins,
visible-light-driven
thiocarboxylation
alkenes
catalytic
iron
salts
promoters.
The
in-situ-generated
Fe/S
complexes
likely
able
reduce
anion,
could
react
give
stabilized
radical.
Moreover,
charge-transfer
complex
(CTC)
thiolate
acrylate/styrene
hydrocarboxylation
generation
or
alkene
anion.
On
basis
novel
CTC,
organocatalytic
Hantzsch
ester
effective
reductant.
Angewandte Chemie International Edition,
Journal Year:
2019,
Volume and Issue:
58(34), P. 11586 - 11598
Published: Jan. 2, 2019
Abstract
Palladium
catalysis
induced
by
visible
light
is
an
emerging
field
of
catalysis.
In
contrast
to
classical
reactions
catalyzed
Pd
complexes
in
the
ground
state,
which
mostly
proceed
through
two‐electron
redox
processes,
mechanisms
these
new
methods
based
on
photoexcited
usually
operate
transfer
a
single
electron.
Such
processes
lead
putative
hybrid
Pd/radical
species,
exhibit
both
radical
and
Pd‐type
reactivity.
This
Minireview
highlights
recent
progress
this
rapidly
growing
area.
Journal of the American Chemical Society,
Journal Year:
2020,
Volume and Issue:
142(22), P. 10173 - 10183
Published: May 7, 2020
Developing
efficient
and
selective
strategies
to
approach
complex
architectures
containing
(multi)stereogenic
centers
has
been
a
long-standing
synthetic
challenge
in
both
academia
industry.
Catalytic
cascade
reactions
represent
powerful
means
of
rapidly
leveraging
molecular
complexity
from
simple
feedstocks.
Unfortunately,
carrying
out
Heck-type
involving
unactivated
(tertiary)
alkyl
halides
remains
an
unmet
owing
unavoidable
β-hydride
elimination.
Herein,
we
show
that
modular,
practical,
general
palladium-catalyzed,
radical
three-component
coupling
can
indeed
overcome
the
aforementioned
limitations
through
interrupted
Heck/allylic
substitution
sequence
mediated
by
visible
light.
Selective
1,4-difunctionalization
1,3-dienes,
such
as
butadiene,
achieved
employing
different
commercially
available
nitrogen-,
oxygen-,
sulfur-,
or
carbon-based
nucleophiles
bromides
(>130
examples,
mostly
>95:5
E/Z,
>20:1
rr).
Sequential
C(sp3)–C(sp3)
C–X
(N,
O,
S)
bonds
have
constructed
efficiently
with
broad
scope
high
functional
group
tolerance.
The
flexibility
versatility
strategy
illustrated
gram-scale
reaction
streamlined
syntheses
ether,
sulfone,
tertiary
amine
products,
some
which
would
be
difficult
access
via
currently
established
methods.
Angewandte Chemie International Edition,
Journal Year:
2018,
Volume and Issue:
57(48), P. 15841 - 15846
Published: Oct. 8, 2018
Despite
a
well-developed
and
growing
body
of
work
in
Cu
catalysis,
the
potential
to
serve
as
photocatalyst
remains
underexplored.
Reported
herein
is
first
example
visible-light-induced
Cu-catalyzed
decarboxylative
C(sp3
)-H
alkylation
glycine
for
preparing
α-alkylated
unnatural
α-amino
acids.
It
merits
mentioning
that
mild
conditions
good
functional-group
tolerance
allow
modification
peptides
using
this
method.
The
mechanistic
studies
revealed
radical-radical
coupling
pathway
involved
reaction.