Journal of the American Chemical Society,
Год журнала:
2020,
Номер
142(13), С. 5918 - 5923
Опубликована: Март 24, 2020
The
reaction
of
carboxylic
acid
derivatives
with
amines
to
form
amide
bonds
has
been
the
most
widely
used
transformation
in
organic
synthesis
over
past
century.
Its
utility
is
driven
by
broad
availability
starting
materials
as
well
kinetic
and
thermodynamic
driving
force
for
bond
formation.
As
such,
invention
new
reactions
between
that
strategically
deviate
from
formation
remains
both
a
challenge
an
opportunity
synthetic
chemists.
This
report
describes
development
nickel-catalyzed
decarbonylative
couples
(hetero)aromatic
esters
scope
(hetero)aryl
amine
products.
successful
realization
this
was
predicated
on
strategic
design
cross-coupling
partners
(phenol
silyl
amines)
preclude
conventional
reactivity
forms
inert
byproducts.
Organic & Biomolecular Chemistry,
Год журнала:
2021,
Номер
19(19), С. 4213 - 4227
Опубликована: Янв. 1, 2021
In
this
review
article,
recent
advances
in
nickel-catalyzed
hydrogen
auto-transfer
(HA)
and
acceptorless
dehydrogenative
coupling
(ADC)
reactions
for
the
construction
of
C–C
C–N
bonds
have
been
discussed.
Journal of the American Chemical Society,
Год журнала:
2022,
Номер
144(3), С. 1144 - 1151
Опубликована: Янв. 11, 2022
Given
the
wide
prevalence
and
ready
availability
of
both
phenols
amines,
aniline
synthesis
through
direct
coupling
between
these
starting
materials
would
be
extremely
attractive.
Herein,
we
describe
a
rhodium-catalyzed
amination
phenols,
which
provides
concise
access
to
diverse
anilines,
with
water
as
sole
byproduct.
The
arenophilic
rhodium
catalyst
facilitates
inherently
difficult
keto–enol
tautomerization
by
means
π-coordination,
allowing
for
subsequent
dehydrative
condensation
amines.
We
demonstrate
generality
this
redox-neutral
catalysis
carrying
out
reactions
large
array
various
electronic
properties
variety
primary
secondary
Several
examples
late-stage
functionalization
structurally
complex
bioactive
molecules,
including
pharmaceuticals,
further
illustrate
potential
broad
utility
method.
Journal of the American Chemical Society,
Год журнала:
2022,
Номер
144(42), С. 19635 - 19648
Опубликована: Окт. 17, 2022
The
dialkyl-ortho-biaryl
class
of
phosphines,
commonly
known
as
Buchwald-type
ligands,
are
among
the
most
important
phosphines
in
Pd-catalyzed
cross-coupling.
These
ligands
have
also
been
successfully
applied
to
several
synthetically
valuable
Ni-catalyzed
cross-coupling
methodologies
and,
demonstrated
this
work,
top
performing
Suzuki
Miyaura
Coupling
(SMC)
and
C-N
coupling
reactions,
even
outperforming
employed
bisphosphines
like
dppf
many
circumstances.
However,
little
is
about
their
structure-reactivity
relationships
(SRRs)
with
Ni,
limited
examples
well-defined,
catalytically
relevant
Ni
complexes
exist.
In
we
report
analysis
phosphine
SRRs
four
representative
reactions.
Our
study
was
guided
by
data-driven
classification
analysis,
which
together
mechanistic
organometallic
studies
structurally
characterized
Ni(0),
Ni(I),
Ni(II)
allowed
us
rationalize
reactivity
patterns
catalysis.
Overall,
expect
that
will
serve
a
platform
for
further
exploration
ligand
organonickel
chemistry
well
development
new
methodologies.
Organic Process Research & Development,
Год журнала:
2023,
Номер
27(7), С. 1160 - 1184
Опубликована: Март 20, 2023
Earth-abundant
metal
(EAM)
catalysis
can
have
profound
impact
in
the
pharmaceutical
industry
terms
of
sustainability
and
cost
improvements
from
replacing
precious
metals
like
palladium
as
well
harnessing
differential
reactivity
first-row
that
allows
for
novel
transformations
to
enable
more
efficient
routes
clinical
candidates.
The
strategy
building
these
capabilities
within
process
group
at
Bristol
Myers
Squibb
is
described
herein,
with
general
plan
a
reaction
screening
platform,
demonstrating
scalability,
increasing
mechanistic
understanding
catalyst
activation.
development
catalytic
utilizing
nickel,
cobalt,
iron
while
highlighting
importance
collaboration
internal
external
groups
advance
EAM
our
portfolio.
challenges
benefits
working
transition
metals,
including
metrics
implementation
catalysis,
such
cost,
mass
intensity,
commercial
availability
catalysts
ligands,
are
discussed.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(42)
Опубликована: Авг. 28, 2023
Abstract
The
combination
of
a
nickel(II)
catalyst
and
mechanoredox
under
ball‐milling
conditions
promotes
mechanical‐force‐driven
C−N
cross‐coupling
reactions.
In
this
nickel(II)/mechanoredox
cocatalyst
system,
the
modulation
oxidation
state
nickel
center,
induced
by
piezoelectricity,
is
used
to
facilitate
highly
efficient
aryl‐amination
reaction,
which
characterized
broad
substrate
scope,
an
inexpensive
catalysts
(NiBr
2
BaTiO
3
),
short
reaction
times,
almost
negligible
quantity
solvents.
Moreover,
can
be
readily
up‐scaled
multi‐gram
scale,
all
synthetic
operations
carried
out
atmospheric
without
need
for
complicated
setups.
Furthermore,
force‐induced
system
suitable
excitation‐energy‐accepting
molecules
poorly
soluble
polyaromatic
substrates
that
are
incompatible
with
solution‐based
nickel(II)/photoredox
cocatalysts.
ACS Catalysis,
Год журнала:
2024,
Номер
14(9), С. 6897 - 6914
Опубликована: Апрель 19, 2024
A
family
of
4,4′-tBu2-2,2′-bipyridine
(tBubpy)
ligands
with
substituents
in
either
the
6-position,
4,4′-tBu2-6-Me-bpy
(tBubpyMe),
or
6
and
6′-positions,
4,4′-tBu2-6,6′-R2-bpy
(tBubpyR2;
R
=
Me,
iPr,
sBu,
Ph,
Mes),
was
synthesized.
These
were
used
to
prepare
Ni
complexes
0,
I,
II
oxidation
states.
We
observed
that
6′-positions
tBubpy
ligand
impact
properties
complexes.
For
example,
bulkier
6,6′-positions
better
stabilized
(tBubpyR2)NiICl
species
resulted
a
cleaner
reduction
from
(tBubpyR2)NiIICl2.
However,
hindered
prevented
coordination
tBubpyR2
Ni0(cod)2.
In
addition,
by
using
type
(tBubpyMe)NiCl2
(tBubpyR2)NiCl2
as
precatalysts
for
different
XEC
reactions,
we
demonstrated
6,6′-substituents
lead
major
differences
catalytic
performance.
Specifically,
while
(tBubpyMe)NiIICl2
is
one
most
active
catalysts
reported
date
can
facilitate
reactions
at
room
temperature,
lower
turnover
frequencies
containing
ligands.
detailed
study
on
intermediates
(tBubpy)Ni(Ar)I
(tBubpyMe2)Ni(Ar)I
revealed
several
factors
likely
contributed
activity.
whereas
are
low
spin
relatively
stable,
high-spin
less
stable.
Furthermore,
captures
primary
benzylic
alkyl
radicals
more
slowly
than
(tBubpy)Ni(Ar)I,
consistent
activity
former
catalysis.
Our
findings
will
assist
design
tailor-made
Ni-catalyzed
transformations.
Angewandte Chemie International Edition,
Год журнала:
2019,
Номер
59(5), С. 2110 - 2114
Опубликована: Дек. 12, 2019
Abstract
A
nickel‐catalyzed
aryl
thioether
metathesis
has
been
developed
to
access
high‐value
thioethers.
1,2‐Bis(dicyclohexylphosphino)ethane
(dcype)
is
essential
promote
this
highly
functional‐group‐tolerant
reaction.
Furthermore,
synthetically
challenging
macrocycles
could
be
obtained
in
good
yield
an
unusual
example
of
ring‐closing
that
does
not
involve
alkene
bonds.
In‐depth
organometallic
studies
support
a
reversible
Ni
0
/Ni
II
pathway
product
formation.
Overall,
work
only
provides
more
sustainable
alternative
previous
catalytic
systems
based
on
Pd,
but
also
presents
new
applications
and
mechanistic
information
are
relevant
the
further
development
application
single‐bond
reactions.
Advanced Synthesis & Catalysis,
Год журнала:
2019,
Номер
361(7), С. 1662 - 1667
Опубликована: Янв. 25, 2019
Abstract
A
convenient
C−H
amination
of
quinoxalin‐2‐ones
has
been
developed.
This
transformation
provides
concise
access
to
3‐aminoquinoxalin‐2(1
H
)‐ones
with
a
broad
tolerance
functional
groups,
utilizing
TMSN
3
as
an
amino
source
under
simple
and
mild
conditions.
The
target
are
important
intermediates
for
the
synthesis
biologically
active
3‐
N
‐substituted
quinoxalin‐2‐one
derivatives.
magnified
image
Angewandte Chemie International Edition,
Год журнала:
2019,
Номер
58(19), С. 6391 - 6395
Опубликована: Март 16, 2019
Abstract
Base‐metal
catalysts
capable
of
enabling
the
assembly
heteroatom‐dense
molecules
by
cross‐coupling
primary
heteroarylamines
and
(hetero)aryl
chlorides,
while
sought‐after
given
ubiquity
unsymmetrical
di(hetero)arylamino
fragments
in
pharmacophores,
are
unknown.
Herein,
we
disclose
new
“double
cage”
bisphosphine
PAd2‐DalPhos
(
L2
).
The
derived
air‐stable
Ni
II
pre‐catalyst
C2
functions
well
at
low
loadings
challenging
test
C−N
cross‐couplings
with
established
substrates,
facilitates
first
Ni‐catalyzed
five‐
or
six‐membered
ring
activated
synthetically
useful
scope
that
is
competitive
Pd
catalysis.