Site‐Selective Ortho/Ipso C−H Difunctionalizations of Arenes using Thianthrene as a Leaving Group
Angewandte Chemie International Edition,
Год журнала:
2024,
Номер
63(30)
Опубликована: Май 7, 2024
Abstract
Site‐selective
ortho/ipso
C−H
difunctionalizations
of
aromatic
compounds
were
designed
to
afford
polyfunctionalized
arenes
including
challenging
1,2,3,4‐tetrasubstituted
ones
(62
examples,
up
97
%
yields).
To
ensure
the
excellent
regioselectivity
process
while
keeping
high
efficiency,
an
original
strategy
based
on
a
“C−H
thianthenation/Catellani‐type
reaction”
sequence
was
developed
starting
from
simple
arenes.
Non‐prefunctionalized
first
regioselectively
converted
into
corresponding
thianthrenium
salts.
Then,
palladium‐catalyzed,
norbornene
(NBE)‐mediated
allowed
synthesis
ipso
‐olefinated/
ortho
‐alkylated
using
thianthrene
as
leaving
group
(revisited
Catellani
reaction).
Pleasingly,
commercially
available
(NBE)
and
unique
catalytic
system,
synthetic
challenges
known
for
reaction
with
aryl
iodides
smoothly
successfully
tackled
“thianthrenium”
approach.
The
protocol
robust
(gram‐scale
reaction)
widely
applied
two‐fold
functionalization
various
bio‐active
compounds.
Moreover,
panel
olefins
alkyl
halides
coupling
partners
suitable.
further
incorporation
other
groups
at
(CN/alkyl/H,
aryl)
(alkyl,
aryl,
amine,
thiol)
positions,
showcasing
generality
process.
Язык: Английский
Palladium-Catalyzed Hiyama-Type Coupling of Thianthrenium and Phenoxathiinium Salts
Organic Letters,
Год журнала:
2024,
Номер
26(31), С. 6681 - 6686
Опубликована: Июль 26, 2024
Here,
we
demonstrate
palladium-catalyzed
Hiyama-type
cross-coupling
reactions
of
aryl
thianthrenium
or
phenoxathiinium
salts.
By
employing
stable
and
inexpensive
organosilanes,
the
arylation,
alkenylation,
alkynylation
were
realized
in
high
efficiency
using
commercially
available
Pd(tBu3P)2
as
catalyst,
thus
providing
a
reliable
method
for
preparation
biaryls,
styrenes,
acetylenes
with
broad
functional
group
tolerance
under
mild
conditions.
Given
accessibility
salts
from
simple
arenes
remarkable
regioselective
fashion,
this
protocol
also
provides
an
attractive
approach
late-stage
modification
complex
bioactive
scaffolds.
Язык: Английский
Palladium-Catalyzed Oxidative Cycloaddition of 1-Indanones and Internal Aryl Alkynes toward Benzo[c]fluorenone Derivatives
Xu Zhang,
Tongtong Ni,
Mengfan Chang
и другие.
Chemical Communications,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
An
efficient
palladium-catalyzed
dehydrogenative
[4+2]
annulation
of
1-indanones
with
alkynes
results
in
the
generation
diverse
benzo[
c
]fluorenone
derivatives
satisfactory
yields
and
regioselectivity.
Язык: Английский
La(OTf)3-Catalyzed Benzannulation of 2-Arylidene-1H-indene-1,3(2H)-diones with Enamino Esters: Direct Access to Functionalized Fluorenone Derivatives
The Journal of Organic Chemistry,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 7, 2025
An
attractive
method
for
the
preparation
of
functional
fluorenone
derivatives
has
been
developed
via
La(OTf)3-catalyzed
benzannulation
2-arylidene-1H-indene-1,3(2H)-diones
with
enamino
esters.
The
reaction
involves
Michael
addition,
intramolecular
cyclization,
dehydration,
and
aromatization
in
a
one-step
process
affords
wide
range
moderate
to
good
yields.
Moreover,
this
protocol
provides
several
advantages,
including
broad
substrate
scope,
readily
available
materials,
high
atom
economy,
applicability
large-scale
synthesis.
Язык: Английский
Modular Synthesis of Polysubstituted α-Phosphorylated Arenes via the Catellani Strategy
Organic Letters,
Год журнала:
2024,
Номер
26(27), С. 5770 - 5775
Опубликована: Июнь 28, 2024
In
this
paper,
we
described
a
palladium/norbornene-catalyzed
Язык: Английский
New trends for transition metal-catalyzed ortho/ipso difunctionalizations of arenes
Chem,
Год журнала:
2024,
Номер
10(9), С. 2651 - 2665
Опубликована: Июль 29, 2024
Язык: Английский
Palladium-Catalyzed Domino Heteroarylation of Thioamides: A Simple Route to Benzothieno[2,3-b]quinolones
Manojkumar Janni,
Annaram Thirupathi,
Subhashini V Subramanian
и другие.
Synthesis,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 4, 2024
Abstract
Domino
reactions
are
essential
for
advancing
organic
synthesis.
This
study
introduces
novel
thioamide-based
precursors
a
palladium-catalyzed
selective
domino
heteroarylation
process.
The
method
efficiently
produces
benzothieno[2,3-b]quinolones
with
yields
ranging
from
moderate
to
very
good.
By
employing
aryl
chlorides,
the
efficiency
of
hetero-annulation
process
is
comparable
that
bromides.
Executing
one-pot,
two-step
reaction
also
delivered
single
product
high
selectivity.
strategy
involved
fine-tuning
substituent
reactivity,
utilizing
electron-rich
arenes,
and
forming
metallocycles
nucleophilic
sulfur,
consistently
yielding
product.
proposed
mechanism
corroborated
by
mechanistic
studies.
Язык: Английский
Dehydrogenative [4 + 2] Annulation of 1-Indanones with Alkynes Enabled by In-Situ-Generated Nickel Hydride
Xu Zhang,
Mengfan Chang,
Tongtong Ni
и другие.
Organic Letters,
Год журнала:
2024,
Номер
26(31), С. 6619 - 6624
Опубликована: Июль 29, 2024
A
practical
and
effective
nickel-catalyzed
dehydrogenative
[4
+
2]
annulation
of
1-indanones
with
alkynes
was
reported.
In
this
protocol,
desaturation
nickel
hydride
catalyzed
coupling
were
first
incorporated.
cyclopentadiene-type
species
generated
in
situ
via
β-H
elimination,
they
subsequently
reacted
a
wide
variety
to
afford
various
benzo[a]fluorenone
derivatives
good
yields
regioselectivity.
Язык: Английский
Site‐Selective Ortho/Ipso C−H Difunctionalizations of Arenes using Thianthrene as a Leaving Group
Angewandte Chemie,
Год журнала:
2024,
Номер
136(30)
Опубликована: Май 7, 2024
Abstract
Site‐selective
ortho/ipso
C−H
difunctionalizations
of
aromatic
compounds
were
designed
to
afford
polyfunctionalized
arenes
including
challenging
1,2,3,4‐tetrasubstituted
ones
(62
examples,
up
97
%
yields).
To
ensure
the
excellent
regioselectivity
process
while
keeping
high
efficiency,
an
original
strategy
based
on
a
“C−H
thianthenation/Catellani‐type
reaction”
sequence
was
developed
starting
from
simple
arenes.
Non‐prefunctionalized
first
regioselectively
converted
into
corresponding
thianthrenium
salts.
Then,
palladium‐catalyzed,
norbornene
(NBE)‐mediated
allowed
synthesis
ipso
‐olefinated/
ortho
‐alkylated
using
thianthrene
as
leaving
group
(revisited
Catellani
reaction).
Pleasingly,
commercially
available
(NBE)
and
unique
catalytic
system,
synthetic
challenges
known
for
reaction
with
aryl
iodides
smoothly
successfully
tackled
“thianthrenium”
approach.
The
protocol
robust
(gram‐scale
reaction)
widely
applied
two‐fold
functionalization
various
bio‐active
compounds.
Moreover,
panel
olefins
alkyl
halides
coupling
partners
suitable.
further
incorporation
other
groups
at
(CN/alkyl/H,
aryl)
(alkyl,
aryl,
amine,
thiol)
positions,
showcasing
generality
process.
Язык: Английский