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1.53k
38,279,298
38279298
Zu and Kinjo investigated the regioselective cycloaddition involving 1,2-diboraallene 25 and azide, without catalysis and using mild conditions, leading to diboratriazole 26.
cycloaddition
1,2-diboraallene 25, azide
diboratriazole 26
null
null
null
null
null
success
null
null
without catalysis, mild conditions
null
B1=NN=NB1
21,506,178
21506178
The coupling of 2-chloropyridine with the N⁹-p-methoxybenzyl (PMB)-protected adenine 55 gave rise to 8-pyridyladenine 56 in 55% yield using a Pd(OH)₂/CuI system in combination with Cs₂CO₃ as the base.
heteroarylation
2-chloropyridine, N⁹-p-methoxybenzyl (PMB)-protected adenine 55
8-pyridyladenine 56
Cs₂CO₃
Pd(OH)₂/CuI
null
55
unspecified
success
null
null
null
null
Nc1ncnc2nc(-c3ccccn3)[nH]c12
17,525,926
17525926
6-(2-Dimethylaminonaphthoyl)alanine (DANA) was prepared by Imperiali and co-workers through the asymmetric alkylation of 2 with α-bromo ketone 81 and 17e as a phase-transfer catalyst.
alkylation
2, α-bromo ketone 81
6-(2-Dimethylaminonaphthoyl)alanine
null
17e
null
null
null
success
null
null
Asymmetric alkylation utilizing a phase-transfer catalyst.
null
CCN(CC)N=O
11,848,980
11848980
Whitehurst and collaborators showed that the condensation of 2-methylcyclopentane-1,3-dione (49) with methyl vinyl ketone gave 4-hydroxy-1,4-dimethylbicyclo[3.2.1]octane-7,8-dione (50) as a byproduct.
condensation
2-methylcyclopentane-1,3-dione, methyl vinyl ketone
4-hydroxy-1,4-dimethylbicyclo[3.2.1]octane-7,8-dione
null
null
null
null
null
success
null
null
obtained as byproduct
null
CC12CCC(C)(O)C(CC1=O)C2=O
15,186,185
15186185
Treatment of allyl phenyl ether... produced o-allylphenol almost quantitatively... Similar results were attained in the presence of ethylaluminum dichloride.
aromatic Claisen rearrangement
allyl phenyl ether
o-allylphenol
ethylaluminum dichloride
null
hexane
null
quantitative
success
room temperature
null
null
null
C=CCC1(O)C=CC=CC1
12,744,695
12744695
After activation of the resulting allylic alcohol as the carbonate 235, the nitroacetic acid ethyl ester was introduced under palladium catalysis. 236, the precursor of (±)- carbovir, was isolated in quantitative yield.
cross-coupling
carbonate 235, nitroacetic acid ethyl ester
236
null
palladium
null
null
quantitative
success
null
null
null
null
O=C([O-])C[N+](=O)[O-]
30,875,202
30875202
The ZnI₂-catalyzed reaction of chiral nitorone 2 with silyl ketene acetal gives methyl (2S,3R)-[1,3-bis(tert-butyldimethylsilyloxy)pyrrolidin-2-yl]acetate in a 90:10 trans/cis ratio.
Mannich-type addition
nitorone 2, silyl ketene acetal
methyl (2S,3R)-[1,3-bis(tert-butyldimethylsilyloxy)pyrrolidin-2-yl]acetate
null
ZnI₂
null
null
null
success
null
null
Product obtained in a 90:10 trans/cis ratio.
null
COC(=O)C[C@H]1[C@H](O[Si](C)(C)C(C)(C)C)CCN1O[Si](C)(C)C(C)(C)C
19,831,366
19831366
Application of a modified Polonovski reaction for serratinine 244 resulted in generation of serratezomine A 245.
Polonovski reaction
serratinine
serratezomine A
null
null
null
null
null
success
null
null
Modified Polonovski reaction.
null
C[C@H]1C[C@@H]2OC(=O)C[C@H]([C@H]1O)[C@]21CCCN2CCC[C@@H]21
17,488,063
17488063
Subsequent multistep reduction with LiAlH₄ gave a tetrol, which was cyclized to the final product (-)-eudesmin (26) by dehydration again using BF₃·OEt₂.
cyclization
tetrol
(-)-eudesmin (26)
null
BF₃·OEt₂
null
null
null
success
null
null
dehydration step
null
COc1ccc([C@@H]2OC[C@@H]3[C@H]2CO[C@H]3c2ccc(OC)c(OC)c2)cc1OC
27,018,601
27018601
Cyclobutene rac-328 was quantitatively obtained from maleic anhydride and propargyl alcohol upon irradiation of a MeCN solution in the presence of acetophenone.
[2 + 2] photocycloaddition
maleic anhydride, propargyl alcohol
cyclobutene rac-328
acetophenone
null
MeCN
null
quantitative
success
null
null
irradiation
null
C1=CCC1
17,410,611
17410611
treatment of 146 with HCl resulted in the formation of [{(IPr)PdCl2}2] (110).
substitution
compound 146, HCl
[{(IPr)PdCl2}2]
null
null
null
null
null
success
null
null
null
null
[Cl][Pd][Cl]
36,677,727
36677727
3-Nitro-4-(trichloromethyl)pyrrolidine 30 was obtained through the cycloaddition of trans-3,3,3-trichloro-1-nitroprop-1-ene 29 with azomethine ylide (obtained from the condensation of paraformaldehyde and sarcosine in refluxing benzene).
cycloaddition
trans-3,3,3-trichloro-1-nitroprop-1-ene, paraformaldehyde, sarcosine
3-Nitro-4-(trichloromethyl)pyrrolidine
null
null
benzene
null
null
success
reflux
null
null
null
O=[N+]([O-])C1CNCC1C(Cl)(Cl)Cl
16,011,327
16011327
The N-arylation under solid-phase conditions was carried out in the presence of P(t-Bu)₃ and Cy₂NMe in toluene at 80 °C when it involved the substitution of the C-N bond for a C-Br bond for the intramolecular cyclization of immobilized α-acetamidoβ-(o-bromophenyl)acrylates.
Buchwald/Hartwig intramolecular N-arylation
immobilized α-acetamidoβ-(o-bromophenyl)acrylates
indole
Cy₂NMe
Pd₂(dba)₃, P(t-Bu)₃
toluene
null
null
success
80 °C
null
Solid-phase synthesis; substitution of C-N bond for C-Br bond.
null
c1ccc2[nH]ccc2c1
21,506,178
21506178
Furan-2-carboxylic acid was monoarylated regioselectively, whereas 3-furancarboxylic acid did not lead to any of the desired product.
decarboxylative cross-coupling
3-furancarboxylic acid
desired product
null
null
null
0
unspecified
failed
null
null
null
null
O=C(O)c1ccoc1
18,072,806
18072806
6-(2-Dimethylaminonaphthoyl)alanine (DANA) was prepared by Imperiali through the asymmetric alkylation of 2 with α-bromoketone 54 using 19e as a phase-transfer catalyst.
asymmetric alkylation
2, α-bromoketone 54
6-(2-Dimethylaminonaphthoyl)alanine
null
19e
null
null
null
success
null
null
null
null
CCN(CC)N=O
19,831,366
19831366
A catalytic enantioselective [4 + 2] cycloaddition of cyclopentadiene 2 with propirolamide derivative 17a yielded bridged cycloadduct 18 with 50% yield and 93% ee at -78 °C.
cycloaddition
cyclopentadiene 2, propirolamide derivative 17a
bridged cycloadduct 18
null
null
null
50
unspecified
success
-78 °C
null
null
93% ee
C1=CCC=C1
19,831,366
19831366
A catalytic enantioselective [4 + 2] cycloaddition of cyclopentadiene 2 with propirolamide derivative 17a yielded bridged cycloadduct 18 with 91% yield and 88% ee at -40 °C.
cycloaddition
cyclopentadiene 2, propirolamide derivative 17a
bridged cycloadduct 18
null
null
null
91
unspecified
success
-40 °C
null
null
88% ee
C1=CCC=C1
17,525,926
17525926
High levels of enantioselectivity can be obtained by performing the asymmetric Michael addition of glycine diphenylmethyl ester Schiff base 51 to simple alkyl vinyl ketones, such as methyl vinyl ketone, in diisopropyl ether at 0 °C in the presence of 50 mol % Cs₂CO₃ and 1 mol % ent-50 as the catalyst.
Michael addition
glycine diphenylmethyl ester Schiff base 51, methyl vinyl ketone
methyl vinyl ketone adduct
Cs₂CO₃
ent-50
diisopropyl ether
null
null
success
0 °C
null
50 mol % Cs₂CO₃, 1 mol % ent-50
null
C=CC(C)=O
23,082,820
23082820
the 1,3-cis-difunctionalized cyclopentane 89 or its bicyclic lactol 90a, when treated with 5 mol% of Fe(CO)₅, smoothly evolved to the expected bridged hydroxy ketone 91 as the only observed diastereomer.
domino isomerization–intramolecular aldolization
compound 89, compound 90a
4-hydroxy-bicyclo[3.2.1]octan-2-one
null
Fe(CO)₅
null
null
unspecified
success
null
null
5 mol% catalyst used.
null
O=C1CC(O)C2CCC1C2
11,848,752
11848752
Isomünchnones derived from the Rh2(OAc)4-catalyzed reaction of acyclic diazo imides 150–154 underwent facile cycloaddition onto the tethered π-bond to provide polycyclic adducts 155–159.
1,3-dipolar cycloaddition
acyclic diazo imides 150–154
polycyclic adducts 155–159
null
Rh2(OAc)4
null
null
null
success
null
null
Tandem reaction involving formation of isomünchnone followed by intramolecular cycloaddition.
null
CC(=O)[O-].CC(=O)[O-].CC(=O)[O-].CC(=O)[O-].[Rh+3].[Rh+3]
11,848,752
11848752
Treatment of cyclic diazo imides 160–162 with Rh2(OAc)4 led to good yields of cycloadducts 163-165.
1,3-dipolar cycloaddition
cyclic diazo imides 160–162
cycloadducts 163-165
null
Rh2(OAc)4
null
null
unspecified
success
null
null
Tandem reaction involving formation of isomünchnone followed by intramolecular cycloaddition.
null
CC(=O)[O-].CC(=O)[O-].CC(=O)[O-].CC(=O)[O-].[Rh+3].[Rh+3]
25,337,795
25337795
The Pd-catalyzed amidation of 2b to the amidation product 3b was performed using 2 mol% Pd(OAc)₂ and 4 mol% XPhos, with 2.2 equivalents of K₂CO₃ in Dioxane MeOH at 90 °C for 20 h.
amidation
2b
3b
K2CO3
Pd(OAc)2, XPhos
Dioxane, MeOH
null
null
success
90 °C
20 h
2.2 equiv K2CO3
null
CS(=O)(=O)N1CC(c2ccccc2)=Cc2ccccc21
35,423,221
35423221
Hekmati and co-workers used pramipexole–MWCNTs/palladium as a phosphine-free reusable heterogeneous catalyst for the Sonogashira coupling reaction of a wide range of aryl halides (including aryl bromides, iodides, and chlorides) with phenylacetylene.
Sonogashira coupling
aryl halides, phenylacetylene
corresponding products
null
pramipexole–MWCNTs/Pd
null
null
unspecified
success
null
null
Phosphine-free reusable heterogeneous catalyst.
null
C#Cc1ccccc1
12,744,695
12744695
Ammonolyzis and glycosylation of the 4'-OMe analogues 263a-c afforded the desired 8-aza-7-deazaadenine (264c).
ammonolyzis, glycosylation
263c
8-aza-7-deazaadenine (264c)
null
null
null
null
null
success
null
null
null
null
Nc1ncnc2c1CN=N2
12,744,695
12744695
Whale et al. reported the palladium-catalyzed Heck reaction of 5-iodouridine (52) with esters of acrylic acid to generate a series of esters of the acid (E)-5-(2-carboxyvinyl)uridine (97a–r) in poor to moderate yield.
Heck reaction
5-iodouridine, esters of acrylic acid
(E)-5-(2-carboxyvinyl)uridine
null
palladium
null
null
unspecified
success
null
null
yield was poor to moderate
null
O=C(O)/C=C/c1cn([C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)c(=O)[nH]c1=O
25,635,524
25635524
This photocatalyzed reaction was performed by irradiation of a mixture of the steroidal dienones with trifluoromethyl iodide in the presence of pyridine with ultraviolet light (3500 Å) at room temperature, however, the yields were low (32–42%).
trifluoromethylation
steroidal dienones, trifluoromethyl iodide
α-trifluoromethylated enones
pyridine
null
null
37
unspecified
success
room temperature
null
irradiation with ultraviolet light (3500 Å); yield range 32-42%
null
FC(F)(F)I
17,091,931
17091931
Benzo[4,5]furopyridine (538) can be obtained in a 64% yield by the cross-coupling of diaryl ether 537, when catalyzed by Pd(OAc)₂ under ligand-free conditions.
cross-coupling
diaryl ether 537
benzo[4,5]furopyridine
null
Pd(OAc)₂
null
64
unspecified
success
null
null
ligand-free conditions
null
c1ccc2c(c1)oc1cccnc12
11,848,917
11848917
By the addition of 150 mol % of ZnI₂, the reaction of cyclic nitrone 57 and alkene 133 gives endo-135 as the major isomer with a yield of 82% and a reaction time of 48 h at 35 °C.
1,3-dipolar cycloaddition
compound 57, compound 133
compound 135
ZnI₂
null
null
82
unspecified
success
35 °C
48 h
150 mol % ZnI₂ used; endo:exo ratio improved to 89:11; diastereofacial selectivity improved to 92% de.
null
[I-].[I-].[Zn+2]
11,848,917
11848917
The reaction of 2-[(trimethylsilyl)oxy]furan 143 with chiral nitrones 144 catalyzed by stoichiometric amounts of an activator such as (+)- or (−)-(1pc)₂BOTf gives 145a as the major stereoisomer.
formal 1,3-dipolar cycloaddition
2-[(trimethylsilyl)oxy]furan, compound 144
compound 145a
(+)- or (−)-(1pc)₂BOTf
null
null
null
null
success
null
null
Stoichiometric amounts of activator used; high endo selectivity and diastereofacial selectivity up to 96% de.
null
C[Si](C)(C)Oc1ccco1
11,848,917
11848917
When TMSOTf is used as the catalyst, the reaction of 2-[(trimethylsilyl)oxy]furan 143 with chiral nitrones 144 proceeds via route B to give the butenolide 148 as the product.
formal 1,3-dipolar cycloaddition
2-[(trimethylsilyl)oxy]furan, compound 144
compound 148
null
TMSOTf
null
null
null
success
null
null
Reaction proceeds via intermediate 146 and route B.
null
C[Si](C)(C)OS(=O)(=O)C(F)(F)F
15,991,198
15991198
The final step of the total synthesis of rapamycin involved a double Stille coupling process and proceeded from the naked precursor 72 and trans-1,2-distannyl ethylene 73, under the influence of [PdCl₂(MeCN)₂] (20 mol%) and iPr₂NEt as a dilute solution in DMF/THF at ambient temperature.
double Stille coupling
precursor 72, trans-1,2-distannyl ethylene 73
rapamycin (76)
iPr₂NEt
[PdCl₂(MeCN)₂]
DMF/THF
null
null
success
ambient temperature
null
20 mol% [PdCl₂(MeCN)₂], dilute solution
null
CO[C@H]1C[C@@H]2CC[C@@H](C)[C@@](O)(O2)C(=O)C(=O)N2CCCC[C@H]2C(=O)O[C@H]([C@H](C)C[C@@H]2CC[C@@H](O)[C@H](OC)C2)CC(=O)[C@H](C)/C=C(\C)[C@@H](O)[C@@H](OC)C(=O)[C@H](C)C[C@H](C)/C=C/C=C/C=C/1C
11,848,752
11848752
When rhodium(II) acetate was used as the catalyst [for α-diazo ketone 338], cyclopropane 339 was not formed.
carbenoid addition
α-diazo ketone 338
cyclopropane 339
null
rhodium(II) acetate
null
0
unspecified
failed
null
null
null
null
C1CC1
11,709,863
11709863
the Pd₂(dba)₃·CHCl₃ + 8AsPh₃ completely failed to catalyze the reaction [of chloropurine 244 and Zn(CN)₂ (245)].
cross-coupling
compound 244, zinc cyanide
compound 246
AsPh₃
Pd₂(dba)₃·CHCl₃
NMP
0
unspecified
failed
90 °C
null
null
null
[C-]#N.[C-]#N.[Zn+2]
11,709,863
11709863
Treatment of boronate ester 247 and enantiopure organozinc reagent 248 with a Pd(OAc)₂/TFP catalyst system in benzene afforded a 50-55% yield of the desired product 249.
cross-coupling
compound 247, compound 248
compound 249
TFP
Pd(OAc)₂
benzene
52.5
unspecified
success
null
null
Yield reported as 50-55%.
null
N[C@@H](Cc1ccc(B(O)O)cc1)C(=O)O
36,080,422
36080422
Hiyama coupling reaction of iodobenzene 76 and phenyl trimethoxysilane 8 resulted in 96% yield of biaryl product 92, catalyzed by Pd/ZnO nanoparticles using K2CO3 as the base in ethylene glycol under an air atmosphere at 100 °C.
Hiyama coupling
iodobenzene 76, phenyl trimethoxysilane 8
biaryl product 92
K2CO3
Pd/ZnO nanoparticles
ethylene glycol
96
unspecified
success
100 °C
null
air atmosphere
null
c1ccc(-c2ccccc2)cc1
36,080,422
36080422
The reaction of 4-methylphenylbromide 123 was performed with phenyl trimethoxysilane 8 using PS-PdONPs (1.5 mol%) catalyst, TBAC in aqueous NaOH solution at 80 °C under aerobic conditions for 3 h, which afforded 4-methylbiphenyl 79 in 88% yield.
Hiyama coupling
4-methylphenylbromide 123, phenyl trimethoxysilane 8
4-methylbiphenyl 79
TBAC, NaOH
PS-PdONPs
aqueous NaOH solution
88
unspecified
success
80 °C
3 h
aerobic conditions, 1.5 mol% catalyst
null
Cc1ccc(-c2ccccc2)cc1
36,080,422
36080422
The catalytic effect of PS-PdNPs on the Hiyama coupling reaction was observed, and it was noticed that the desired coupled product was not attained, but 4,4′-dimethylbiphenyl 124, the Ullmann coupling product, was afforded in 99% yield.
Ullmann coupling
4-methylphenylbromide 123
4,4′-dimethylbiphenyl 124
TBAC, NaOH
PS-PdNPs
aqueous NaOH solution
99
unspecified
success
80 °C
3 h
aerobic conditions; described as the result of a failed Hiyama coupling attempt
null
Cc1ccc(-c2ccc(C)cc2)cc1
36,080,422
36080422
The reaction of iodobenzene 76 with phenyl trimethoxysilane 8 using 4 mol% Pd(OAc)2 in 115 and CH3CN and 1-butyl-3-methylimidazolium fluoride [bmim]F at 70–120 °C for 8 h afforded the desired biphenyl derivative in 98% yield.
Hiyama cross-coupling
iodobenzene, phenyl trimethoxysilane
biphenyl derivative
1-butyl-3-methylimidazolium fluoride
Pd(OAc)2
CH3CN, 115
98
unspecified
success
70–120 °C
8 h
4 mol% Pd(OAc)2
null
Ic1ccccc1
36,080,422
36080422
The reaction of 11 with phenyltriethoxysilane 16 was carried out by utilizing Pd@M-SBA-15 (0.5 mol%) catalyst, acetic acid, and TBAF.3H2O in toluene at 100 °C in the air for 24 h resultantly afforded the corresponding biphenyl derivative 38 in 92% yield.
Hiyama cross-coupling
11, phenyltriethoxysilane
biphenyl derivative 38
acetic acid, TBAF.3H2O
Pd@M-SBA-15
toluene
92
unspecified
success
100 °C
24 h
in the air, 0.5 mol% catalyst
null
CC(=O)c1ccc(Br)cc1
27,018,601
27018601
Enantiomerically pure N-cinnamyl-4-vinyloxazolidin-2-one (31) underwent a highly diastereoselective [2 + 2] photocycloaddition to product 32.
[2 + 2] photocycloaddition
N-cinnamyl-4-vinyloxazolidin-2-one
32
null
Cu(I)
null
null
null
success
null
null
null
null
C=CC1COC(=O)N1CC=Cc1ccccc1
22,000,119
22000119
The procedure described at Section 4.5 was employed using 7b (0.10 g, 0.41 mmol), dry ammonium acetate (0.31 g, 4.10 mmol), 2d (0.13 g, 0.41 mmol), and dry methanol (5 mL) at 100 °C for 24 h to yield 36 mg (0.10 mmol, 26.1%) of 2-Phenyl-4-(pyridin-3-yl)-5,6-dihydrothieno[2,3-h]quinoline (33) as a white solid.
null
7b, 2d
2-Phenyl-4-(pyridin-3-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate
null
methanol
26.1
isolated
success
100 °C
24 h
36 mg isolated
null
c1ccc(-c2cc(-c3cccnc3)c3c(n2)-c2ccsc2CC3)cc1
22,000,119
22000119
The procedure described at Section 4.4 was employed using 6b (0.08 g, 0.34 mmol), dry ammonium acetate (0.26 g, 3.40 mmol), 2a (0.11 g, 0.34 mmol), and dry methanol (2.0 mL) at 100 °C for 12 h to yield 52 mg (45.4%) of 2-(Pyridin-2-yl)-4-(pyridin-3-yl)-5,6-dihydro-1,10-phenanthroline (14) as a white solid.
null
6b, 2a
2-(Pyridin-2-yl)-4-(pyridin-3-yl)-5,6-dihydro-1,10-phenanthroline
ammonium acetate
null
methanol
45.4
isolated
success
100 °C
12 h
52 mg isolated as a white solid
null
c1ccc(-c2cc(-c3cccnc3)c3c(n2)-c2ncccc2CC3)nc1
11,848,752
11848752
When a-diazo ketone 489a containing a terminal triple bond was treated with Rh₂(OAc)₄ in benzene with diallyl sulfide, cyclohexenone 492a was formed in 80% yield.
alkyne metathesis-ylide formation-sigmatropic rearrangement
compound 489a, diallyl sulfide
cyclohexenone 492a
null
Rh₂(OAc)₄
benzene
80
unspecified
success
null
null
null
null
O=C1C=CCCC1
11,848,752
11848752
Subjection of a-diazo ketone 489b (R = Ph) to the same reaction conditions [Rh₂(OAc)₄ in benzene with diallyl sulfide] gave cyclopentenone 492b as the exclusive product.
alkyne metathesis-ylide formation-sigmatropic rearrangement
compound 489b, diallyl sulfide
cyclopentenone 492b
null
Rh₂(OAc)₄
benzene
null
quantitative
success
null
null
exclusive product
null
O=C1C=CCC1
11,093,193
11093193
In the reaction of the isopropyl-substituted alkenylcarbene-chromium complex 270 with sterically demandingly substituted terminal alkynes such as 3,3-dimethylbutyne (271), the seven-membered heterocycle 274 was obtained as a byproduct.
[5+2] cocyclization
isopropyl-substituted alkenylcarbene-chromium complex 270, 3,3-dimethylbutyne
274
null
null
null
null
null
success
null
null
Product 274 was obtained as a byproduct in addition to acylcyclopentenones 272 and 273.
null
C1=CCCNC=C1
11,093,193
11093193
To favor formation of the dihydroazepine 274 possibly still further two equivalents of triphenylphosphane were added to the reaction mixture... Indeed, in this way the yield of 274 could be increased to 23%.
[5+2] cocyclization
isopropyl-substituted alkenylcarbene-chromium complex 270, 3,3-dimethylbutyne
274
triphenylphosphane
null
null
23
unspecified
success
null
null
Two equivalents of triphenylphosphane were added.
null
C1=CCCNC=C1
11,093,193
11093193
In the reaction of 270 with 182 in pyridine the product ratio was shifted towards the dihydroazepine 274, and at the same time under these conditions the tricarbonylchromium fragment was cleaved off. After purification by column chromatography the methylenepyrrolidine 276 was formed.
[5+2] cocyclization
270, 182
methylenepyrrolidine 276
null
null
pyridine
null
null
success
null
null
The reaction shifted towards dihydroazepine 274, but the tricarbonylchromium fragment was cleaved off, leading to 276 after purification by column chromatography.
null
C=C1CCCN1
22,000,119
22000119
The reaction of 7c (0.08 g, 0.35 mmol), dry ammonium acetate (0.27 g, 3.50 mmol), 2d (0.11 g, 0.35 mmol), and glacial acetic acid (0.5 mL) at 90 °C for 14 h yielded 25 mg (0.07 mmol, 20.7%) of 2-Phenyl-4-(pyridin-4-yl)-5,6-dihydrothieno[2,3-h]quinoline (37) as a white solid.
null
7c, 2d
2-Phenyl-4-(pyridin-4-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate
null
glacial acetic acid
20.7
isolated
success
90 °C
14 h
0.08 g 7c, 0.27 g ammonium acetate, 0.11 g 2d, 0.5 mL glacial acetic acid
null
c1ccc(-c2cc(-c3ccncc3)c3c(n2)-c2ccsc2CC3)cc1
27,960,274
27960274
Yamamoto et al. promoted these reactions by a combination of AgOTf (15 mol %) with BINAP (6 mol %) which led to the corresponding chiral β-hydroxy carbonyl compounds in enantioselectivities of up to 95% ee and moderate to good yields (33–83%).
aldol reaction
tributyltin enolates, aldehydes
chiral β-hydroxy carbonyl compounds
null
AgOTf, BINAP
null
83
unspecified
success
null
null
AgOTf 15 mol %, BINAP 6 mol %; yield range 33-83%
null
c1ccc(P(c2ccccc2)c2ccc3ccccc3c2-c2c(P(c3ccccc3)c3ccccc3)ccc3ccccc23)cc1
27,960,274
27960274
Yamamoto et al. developed an alternative asymmetric aldol reaction occurring between benzaldehyde and alkenyl trichloroacetate derived from cyclohexanone based on the same catalyst system using only 5 mol % of Bu3SnOMe, which resulted in the formation of the corresponding aldol product in 82% yield.
aldol reaction
benzaldehyde, alkenyl trichloroacetate derived from cyclohexanone
aldol product
Bu3SnOMe
AgOTf, BINAP
null
82
unspecified
success
null
null
5 mol % Bu3SnOMe
null
O=C1CCCCC1
27,960,274
27960274
In 2009, the same authors applied this catalyst system to the asymmetric aldol reactions of alkenyl trichloroacetates 1a–1c with α-ketoesters 2a–2d. The process was promoted by a combination of 20 mol % of AgOTf, 10 mol % of (R)-BINAP, and 8 mol % of Bu2Sn(OMe)2 in the presence of methanol as superstoichiometric additi...
aldol reaction
alkenyl trichloroacetates 1a–1c, α-ketoesters 2a–2d
aldol product
Bu2Sn(OMe)2, methanol
AgOTf, (R)-BINAP
THF
null
null
success
-20 °C
null
20 mol % AgOTf, 10 mol % (R)-BINAP, 8 mol % Bu2Sn(OMe)2, methanol as superstoichiometric additive
null
c1ccc(P(c2ccccc2)c2ccc3ccccc3c2-c2c(P(c3ccccc3)c3ccccc3)ccc3ccccc23)cc1
22,000,119
22000119
The procedure described at Section 4.4 was employed with 6c (0.08 g, 0.35 mmol), dry ammonium acetate (0.27 g, 3.50 mmol), 2d (0.11 g, 0.35 mmol), and dry methanol (2.5 mL) at 95 °C for 14 h to yield 70 mg (0.21 mmol, 60.2%) of 2-Phenyl-4-(pyridin-4-yl)-5,6-dihydro-1,10-phenanthroline (21) as a white solid.
null
6c, 2d
2-Phenyl-4-(pyridin-4-yl)-5,6-dihydro-1,10-phenanthroline
ammonium acetate
null
methanol
60.2
isolated
success
95 °C
14 h
70 mg isolated
null
c1ccc(-c2cc(-c3ccncc3)c3c(n2)-c2ncccc2CC3)cc1
22,000,119
22000119
The procedure described at Section 4.5 was employed using 7a (0.07 g, 0.30 mmol), dry ammonium acetate (0.23 g, 3.00 mmol), 2d (0.10 g, 0.30 mmol), and glacial acetic acid (0.5 mL) at 100 °C for 12 h to yield 52 mg (50.7%) of 2-Phenyl-4-(pyridin-2-yl)-5,6-dihydrothieno[2,3-h]quinoline (29) as an off-white solid.
null
7a, 2d
2-Phenyl-4-(pyridin-2-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate
null
glacial acetic acid
50.7
isolated
success
100 °C
12 h
52 mg isolated; product obtained as an off-white solid
null
c1ccc(-c2cc(-c3ccccn3)c3c(n2)-c2ccsc2CC3)cc1
22,000,119
22000119
The procedure described at Section 4.5 was used with 7b (0.10 g, 0.40 mmol), dry ammonium acetate (0.30 g, 4.00 mmol), 2a (0.13 g, 0.40 mmol), and dry MeOH (2.5 mL) at 90 °C for 21 h to yield 45 mg (32.3%) of 2-(Pyridin-2-yl)-4-(pyridin-3-yl)-5,6-dihydrothieno[2,3-h]quinoline (30) as a white solid.
null
7b, 2a
2-(Pyridin-2-yl)-4-(pyridin-3-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate
null
MeOH
32.3
isolated
success
90 °C
21 h
45 mg isolated; dry ammonium acetate and dry MeOH used.
null
c1ccc(-c2cc(-c3cccnc3)c3c(n2)-c2ccsc2CC3)nc1
22,000,119
22000119
The procedure described at Section 4.4 was employed with 6b (0.12 g, 0.50 mmol), dry ammonium acetate (0.38 g, 5.00 mmol), 2d (0.16 g, 0.50 mmol), and dry methanol (2.5 mL) at 100 °C for 12 h to yield 127 mg (0.38 mmol, 76.0%) of 2-Phenyl-4-(pyridin-3-yl)-5,6-dihydro-1,10-phenanthroline (17) as a white solid.
null
6b, 2d
2-Phenyl-4-(pyridin-3-yl)-5,6-dihydro-1,10-phenanthroline
ammonium acetate
null
methanol
76
isolated
success
100 °C
12 h
127 mg isolated
null
c1ccc(-c2cc(-c3cccnc3)c3c(n2)-c2ncccc2CC3)cc1
22,000,119
22000119
The procedure described at Section 4.4 was employed with 6c (0.07 g, 0.30 mmol), dry ammonium acetate (0.23 g, 3.00 mmol), 2a (0.10 g, 0.30 mmol), and dry methanol (2.5 mL) at 100 °C for 12 h to yield 41 mg (0.12 mmol, 40.6%) of 2-(Pyridin-2-yl)-4-(pyridin-4-yl)-5,6-dihydro-1,10-phenanthroline (18) as a white solid.
null
6c, 2a
2-(Pyridin-2-yl)-4-(pyridin-4-yl)-5,6-dihydro-1,10-phenanthroline
ammonium acetate
null
methanol
40.6
isolated
success
100 °C
12 h
41 mg isolated as a white solid
null
c1ccc(-c2cc(-c3ccncc3)c3c(n2)-c2ncccc2CC3)nc1
22,000,119
22000119
The reaction of 7c (0.05 g, 0.22 mmol) with dry ammonium acetate (0.17 g, 2.20 mmol) and 2b (0.07 g, 0.22 mmol) in glacial acetic acid (0.5 mL) at 100 °C for 14 h yielded 26 mg (34.6%) of 2-(Pyridin-3-yl)-4-(pyridin-4-yl)-5,6-dihydrothieno[2,3-h]quinoline (35) as a white solid.
null
7c, 2b
2-(Pyridin-3-yl)-4-(pyridin-4-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate
null
glacial acetic acid
34.6
isolated
success
100 °C
14 h
26 mg isolated
null
c1cncc(-c2cc(-c3ccncc3)c3c(n2)-c2ccsc2CC3)c1
22,000,119
22000119
Using the procedure from Section 4.5, 7a (0.06 g, 0.25 mmol), dry ammonium acetate (0.19 g, 2.50 mmol), 2b (0.08 g, 0.25 mmol), and glacial acetic acid (0.5 mL) were reacted at 100 °C for 20 h to yield 43 mg (51.6%) of 4-(Pyridin-2-yl)-2-(pyridin-3-yl)-5,6-dihydrothieno[2,3-h]quinoline (27) as a light yellow solid.
null
7a, 2b
4-(Pyridin-2-yl)-2-(pyridin-3-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate, glacial acetic acid
null
glacial acetic acid
51.6
isolated
success
100 °C
20 h
43 mg isolated; product obtained as a light yellow solid
null
c1ccc(-c2cc(-c3cccnc3)nc3c2CCc2sccc2-3)nc1
22,000,119
22000119
The procedure described at Section 4.4 was employed with 6a (0.09 g, 0.40 mmol), dry ammonium acetate (0.31 g, 4.00 mmol), 2b (0.13 g, 0.40 mmol), and dry methanol (2.5 mL) at 100 °C for 12 h to yield 92 mg (68.3%) of 11 as a white solid.
null
6a, 2b
4-(Pyridin-2-yl)-2-(pyridin-3-yl)-5, 6-dihydro-1, 10-phenanthroline
ammonium acetate
null
methanol
68.3
isolated
success
100 °C
12 h
92 mg isolated; 0.09 g of 6a and 0.13 g of 2b used
null
c1ccc(-c2cc(-c3cccnc3)nc3c2CCc2cccnc2-3)nc1
11,848,752
11848752
diazo ketone 589 was cleanly converted into methylene cyclooctene 590.
rearrangement
diazo ketone 589
methylene cyclooctene 590
null
null
null
null
unspecified
success
null
null
cleanly converted
null
C=C1C=CCCCCC1
22,000,119
22000119
The procedure described at Section 4.5 was employed with 7d (0.09 g, 0.37 mmol), dry ammonium acetate (0.28 g, 3.70 mmol), 2c (0.12 g, 0.37 mmol), and dry methanol (2.5 mL) at 100 °C for 36 h to yield 23 mg (0.06 mmol, 18.0%) of 4-Phenyl-2-(pyridin-4-yl)-5,6-dihydrothieno[2,3-h]quinoline (40) as a white solid.
null
7d, 2c
4-Phenyl-2-(pyridin-4-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate
null
methanol
18
isolated
success
100 °C
36 h
23 mg isolated
null
c1ccc(-c2cc(-c3ccncc3)nc3c2CCc2sccc2-3)cc1
22,000,119
22000119
Compound 38 (4-Phenyl-2-(pyridin-2-yl)-5,6-dihydrothieno[2,3-h]quinoline) was synthesized using 7d (0.12 g, 0.50 mmol), dry ammonium acetate (0.38 g, 5.00 mmol), 2a (0.16 g, 0.50 mmol), and dry methanol (5 mL) at 100 °C for 48 h, yielding 45 mg (26.6%) of the product as a white solid.
null
7d, 2a
4-Phenyl-2-(pyridin-2-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate
null
methanol
26.6
isolated
success
100 °C
48 h
45 mg isolated
null
c1ccc(-c2cc(-c3ccccn3)nc3c2CCc2sccc2-3)cc1
11,749,314
11749314
Palladium-catalyzed cyclization of vinylallene 458 in the presence of carbon monoxide provided a highly functionalized cyclononadienone 459.
cycloaddition
vinylallene 458, carbon monoxide
cyclononadienone 459
null
palladium
null
null
null
success
null
null
The reaction is described as a [4+4+1] cycloaddition.
null
O=C1C=CC=CCCCC1
22,000,119
22000119
A procedure described at Section 4.4 was used with 6a (0.08 g, 0.34 mmol), dry ammonium acetate (0.26 g, 3.40 mmol), 2c (0.11 g, 0.34 mmol) and dry methanol (2.0 mL) at 100 °C for 12 h to yield 72 mg (63.4%) of 4-(Pyridin-2-yl)-2-(pyridin-4-yl)-5,6-dihydro-1,10-phenanthroline (12) as a white solid.
null
6a, 2c
4-(Pyridin-2-yl)-2-(pyridin-4-yl)-5,6-dihydro-1,10-phenanthroline
ammonium acetate
null
methanol
63.4
isolated
success
100 °C
12 h
72 mg isolated
null
c1ccc(-c2cc(-c3ccncc3)nc3c2CCc2cccnc2-3)nc1
22,000,119
22000119
Reacting 7c (0.07 g, 0.30 mmol), dry ammonium acetate (0.23 g, 3.00 mmol), 2a (0.10 g, 0.30 mmol), and glacial acetic acid (0.5 mL) at 100 °C for 12 h yielded 37 mg (0.11 mmol, 36.1%) of 2-(Pyridin-2-yl)-4-(pyridin-4-yl)-5,6-dihydrothieno[2,3-h]quinoline (34) as a light yellow solid.
null
7c, 2a
2-(Pyridin-2-yl)-4-(pyridin-4-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate
null
glacial acetic acid
36.1
isolated
success
100 °C
12 h
37 mg isolated
null
c1ccc(-c2cc(-c3ccncc3)c3c(n2)-c2ccsc2CC3)nc1
22,000,119
22000119
The procedure described at Section 4.4 was employed with 6a (0.09 g, 0.40 mmol), dry ammonium acetate (0.31 g, 4.00 mmol), 2d (0.13 g, 0.40 mmol), and dry methanol (2.5 mL) at 100 °C for 12 h to yield 124 mg (0.37 mmol, 92.4%) of 13 as a white solid.
null
6a, 2d
2-Phenyl-4-(pyridin-2-yl)-5,6-dihydro-1,10-phenanthroline
ammonium acetate
null
methanol
92.4
isolated
success
100 °C
12 h
124 mg of product obtained as a white solid
null
c1ccc(-c2cc(-c3ccccn3)c3c(n2)-c2ncccc2CC3)cc1
22,000,119
22000119
Compound 23 (4-Phenyl-2-(pyridin-3-yl)-5,6-dihydro-1,10-phenanthroline) was synthesized by reacting 6d (0.09 g, 0.40 mmol), dry ammonium acetate (0.30 g, 4.00 mmol), and 2b (0.13 g, 0.40 mmol) in dry methanol (2.5 mL) at 100 °C for 16 h, yielding 81 mg (60.3%) of the product as a white solid.
null
6d, 2b
4-Phenyl-2-(pyridin-3-yl)-5,6-dihydro-1,10-phenanthroline
ammonium acetate
null
methanol
60.3
isolated
success
100 °C
16 h
0.09 g 6d, 0.30 g ammonium acetate, 0.13 g 2b, 2.5 mL dry methanol
null
c1ccc(-c2cc(-c3cccnc3)nc3c2CCc2cccnc2-3)cc1
34,418,288
34418288
For the preparation of the catalyst (6), 1-methylimidazole and 3-trimethoxysilylpropyl chloride compounds were mixed and refluxed for 48 h to generate 1-methyl-3-(3-trimethoxysilylpropyl) imidazolium chloride.
alkylation
1-methylimidazole, 3-trimethoxysilylpropyl chloride
1-methyl-3-(3-trimethoxysilylpropyl) imidazolium chloride
null
null
null
null
null
success
reflux
48 h
null
null
CO[Si](CCC[n+]1ccn(C)c1)(OC)OC.[Cl-]
22,000,119
22000119
Compound 24 (4-Phenyl-2-(pyridin-4-yl)-5,6-dihydro-1,10-phenanthroline) was synthesized using 6d (0.07 g, 0.30 mmol), dry ammonium acetate (0.23 g, 3.00 mmol), and 2c (0.10 g, 0.30 mmol) in dry methanol (2.5 mL) at 100 °C for 16 h, yielding 26 mg (26.2%) of the product as a white solid.
null
6d, 2c
4-Phenyl-2-(pyridin-4-yl)-5,6-dihydro-1,10-phenanthroline
ammonium acetate
null
methanol
26.2
isolated
success
100 °C
16 h
26 mg isolated; dry ammonium acetate and dry methanol used
null
c1ccc(-c2cc(-c3ccncc3)nc3c2CCc2cccnc2-3)cc1
22,000,119
22000119
The procedure described at Section 4.5 was employed with 7c (0.07 g, 0.30 mmol), dry ammonium acetate (0.23 g, 3.00 mmol), 2c (0.10 g, 0.30 mmol), and glacial acetic acid (0.5 mL) at 100 °C for 16 h to yield 28 mg (0.08 mmol, 27.6%) of 2,4-Di(pyridin-4-yl)-5,6-dihydrothieno[2,3-h]quinoline (36) as an off-white solid.
null
7c, 2c
2,4-Di(pyridin-4-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate, glacial acetic acid
null
glacial acetic acid
27.6
isolated
success
100 °C
16 h
28 mg isolated; off-white solid
null
c1cc(-c2cc(-c3ccncc3)c3c(n2)-c2ccsc2CC3)ccn1
22,000,119
22000119
The reaction of 7a (0.10 g, 0.41 mmol), dry ammonium acetate (0.32 g, 4.10 mmol), 2a (0.13 g, 0.41 mmol), and glacial acetic acid (1.5 mL) at 100 °C for 20 h yielded 43 mg (0.12 mmol, 31.0%) of 2,4-Di(pyridin-2-yl)-5,6-dihydrothieno[2,3-h]quinoline (26) as an off-white solid.
null
7a, 2a
2,4-Di(pyridin-2-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate, glacial acetic acid
null
glacial acetic acid
31
isolated
success
100 °C
20 h
43 mg isolated
null
c1ccc(-c2cc(-c3ccccn3)c3c(n2)-c2ccsc2CC3)nc1
22,000,119
22000119
Using the procedure described at Section 4.5, 7d (0.09 g, 0.37 mmol), dry ammonium acetate (0.28 g, 3.70 mmol), 2b (0.12 g, 0.37 mmol), and glacial acetic acid (1 mL) were reacted at 100 °C for 20 h to yield 30 mg (24.2%) of 4-Phenyl-2-(pyridin-3-yl)-5,6-dihydrothieno[2,3-h]quinoline (39) as a light yellow solid.
null
7d, 2b
4-Phenyl-2-(pyridin-3-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate
null
glacial acetic acid
24.2
isolated
success
100 °C
20 h
30 mg isolated; light yellow solid
null
c1ccc(-c2cc(-c3cccnc3)nc3c2CCc2sccc2-3)cc1
22,000,119
22000119
The procedure described at Section 4.4 was employed with 6a (0.10 g, 0.42 mmol), dry ammonium acetate (0.32 g, 4.20 mmol), 2a (0.13 g, 0.42 mmol), and dry methanol (2.5 mL) at 100 °C for 12 h to yield 60 mg (0.19 mmol, 42.6%) of 2,4-Di(pyridin-2-yl)-5,6-dihydro-1,10-phenanthroline (10) as a light yellow solid.
null
6a, 2a
2,4-Di(pyridin-2-yl)-5,6-dihydro-1,10-phenanthroline
ammonium acetate
null
methanol
42.6
isolated
success
100 °C
12 h
60 mg isolated
null
c1ccc(-c2cc(-c3ccccn3)c3c(n2)-c2ncccc2CC3)nc1
22,000,119
22000119
Using the procedure from Section 4.5, 7b (0.15 g, 0.62 mmol), dry ammonium acetate (0.48 g, 6.20 mmol), 2b (0.30 g, 0.93 mmol), and dry methanol (5 mL) were reacted at 100 °C for 24 h to yield 25 mg (12.0%) of 2,4-Di(pyridin-3-yl)-5,6-dihydrothieno[2,3-h]quinoline (31) as a white solid.
null
7b, 2b
2,4-Di(pyridin-3-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate
null
methanol
12
isolated
success
100 °C
24 h
25 mg isolated; dry ammonium acetate and dry methanol used
null
c1cncc(-c2cc(-c3cccnc3)c3c(n2)-c2ccsc2CC3)c1
16,011,324
16011324
Alkylation of the dihydroisoquinoline 235 with trimethylsilylmethyl triflate gave the intermediate iminium salt 236, which was treated with cesium fluoride to give the cycloadduct 237 (Scheme 63).
alkylation
compound 235, trimethylsilylmethyl triflate
compound 236
null
null
null
null
null
success
null
null
null
null
C1=Cc2ccccc2CN1
16,011,324
16011324
Alkylation of the substituted 3,4-dihydroisoquinoline 244 with the iodide 245 gave the salt 246, which was not isolated but treated immediately with base and heated in 1,2-dichloroethane... to give lamellarin K triisopropyl ether 247.
alkylation
substituted 3,4-dihydroisoquinoline 244, iodide 245
compound 246
null
null
null
null
null
success
null
null
Salt 246 was not isolated.
null
C1=NCCc2ccccc21
22,000,119
22000119
A procedure described at Section 4.4 was used with 6d (0.09 g, 0.40 mmol), dry ammonium acetate (0.30 g, 4.00 mmol), 2a (0.13 g, 0.40 mmol), and dry methanol (2.5 mL) at 100 °C for 16 h to yield 88 mg (65.6%) of 4-Phenyl-2-(pyridin-2-yl)-5,6-dihydro-1,10-phenanthroline (22) as a white solid.
null
6d, 2a
4-Phenyl-2-(pyridin-2-yl)-5,6-dihydro-1,10-phenanthroline
ammonium acetate
null
methanol
65.6
isolated
success
100 °C
16 h
88 mg (0.26 mmol) isolated as a white solid; dry methanol used
null
c1ccc(-c2cc(-c3ccccn3)nc3c2CCc2cccnc2-3)cc1
27,960,274
27960274
The asymmetric vinylogous Mannich reaction of aromatic, heteroaromatic, and aliphatic N-aryl aldimines 37a–37h with N-Boc-2-(trimethylsiloxy)pyrrole 32 afforded chiral α,β-unsaturated δ-amino-γ-butyrolactams 38a–38h with yields of 36–99%.
vinylogous Mannich reaction
N-aryl aldimines 37a–37h, N-Boc-2-(trimethylsiloxy)pyrrole 32
chiral α,β-unsaturated δ-amino-γ-butyrolactams 38a–38h
null
null
null
null
unspecified
success
null
null
Yields ranged from 36-99%.
null
CC(C)(C)OC(=O)n1cccc1O[Si](C)(C)C
27,960,274
27960274
A three-component Mannich reaction between alkyl-substituted aldehydes 5a–5g, o-thiomethyl-p-anisidine 17, and N-Boc-2-(trimethylsiloxy)pyrrole 32 using a catalyst system at 5 mol % loading afforded vicinal chiral diamino carbonyl products 39a–39g in yields of 51–92%.
Mannich reaction
alkyl-substituted aldehydes 5a–5g, o-thiomethyl-p-anisidine 17, N-Boc-2-(trimethylsiloxy)pyrrole 32
vicinal chiral diamino carbonyl products 39a–39g
null
null
null
null
unspecified
success
null
null
5 mol % catalyst loading; yields ranged from 51-92%.
null
CC(C)(C)OC(=O)n1cccc1O[Si](C)(C)C
27,960,274
27960274
Hoveyda reinvestigated the three-component Mannich reaction of cyclohexylcarboxaldehyde (R = Cy) with o-thiomethyl-p-anisidine and N-Boc-2-(trimethylsiloxy)pyrrole in the presence of 5 mol % of iso-leucine-derived phosphine ligand 27 and 5 mol % of AgOAc, which led to the corresponding Mannich product in 82% yield.
Mannich reaction
cyclohexylcarboxaldehyde, o-thiomethyl-p-anisidine, N-Boc-2-(trimethylsiloxy)pyrrole
Mannich product
AgOAc
iso-leucine-derived phosphine ligand 27
null
82
unspecified
success
null
null
5 mol % ligand 27 and 5 mol % AgOAc.
null
O=CC1CCCCC1
27,960,274
27960274
Shi et al. used chiral phosphine Schiff base type ligands (11 mol %) and AgOAc (10 mol %) to promote the enantioselective Mannich reaction of aromatic N-aryl aldimines 40a–40h with trimethylsiloxyfuran 18a, producing chiral Mannich products 42a–42h with yields of 51–91%.
Mannich reaction
aromatic N-aryl aldimines 40a–40h, trimethylsiloxyfuran 18a
chiral Mannich products 42a–42h
AgOAc
chiral phosphine Schiff base type ligands
null
null
unspecified
success
null
null
11 mol % ligand and 10 mol % AgOAc; yields ranged from 51-91%.
null
C[Si](C)(C)Oc1ccco1
27,960,274
27960274
It was found that the use of benzyl alcohol as superstoichiometric additive was important to achieve better yield and diastereoselectivity as well as enantioselectivity in the reaction of aromatic N-aryl aldimines 40a–40h with trimethylsiloxyfuran 18a using ligand 41 and AgOAc.
Mannich reaction
aromatic N-aryl aldimines 40a–40h, trimethylsiloxyfuran 18a
chiral Mannich products 42a–42h
AgOAc, benzyl alcohol
ligand 41
null
null
unspecified
success
null
null
Benzyl alcohol used as superstoichiometric additive.
null
C[Si](C)(C)Oc1ccco1
22,000,119
22000119
Compound 16, 4-(Pyridin-3-yl)-2-(pyridin-4-yl)-5,6-dihydro-1,10-phenanthroline, was synthesized using 6b (0.12 g, 0.50 mmol), dry ammonium acetate (0.38 g, 5.00 mmol), 2c (0.16 g, 0.50 mmol), and dry methanol (2.5 mL) at 100 °C for 12 h to yield 58 mg (34.5%) as a white solid.
null
6b, 2c
4-(Pyridin-3-yl)-2-(pyridin-4-yl)-5,6-dihydro-1,10-phenanthroline
ammonium acetate
null
methanol
34.5
isolated
success
100 °C
12 h
58 mg isolated; 0.12 g of 6b, 0.38 g of ammonium acetate, 0.16 g of 2c, 2.5 mL of methanol
null
c1cncc(-c2cc(-c3ccncc3)nc3c2CCc2cccnc2-3)c1
24,090,404
24090404
N-(1-(2,6-Dibutylphenyl)ethyl)picolinamide was synthesized by charging a 2-dram screw-cap vial with Pd(OAc)₂ (10 mol%), CuBr₂ (20 mol %), N-(1-phenylethyl)picolinamide (1 mmol), n-butyl iodide (4 mmol), K₂CO₃ (4 mmol), and water (0.30 mL), then stirring at 120 °C for 24 h.
alkylation
N-(1-phenylethyl)picolinamide, n-butyl iodide
N-(1-(2,6-Dibutylphenyl)ethyl)picolinamide
K₂CO₃
Pd(OAc)₂, CuBr₂
water
99
isolated
success
120 °C
24 h
2-dram screw-cap vial
null
CCCCc1cccc(CCCC)c1C(C)NC(=O)c1ccccn1
22,000,119
22000119
The procedure described at Section 4.5 was employed with 7b (0.07 g, 0.29 mmol), dry ammonium acetate (0.22 g, 2.90 mmol), 2c (0.09 g, 0.29 mmol), and glacial acetic acid (0.5 mL) at 90 °C for 14 h to yield 32 mg (0.09 mmol, 31.7%) of 4-(Pyridin-3-yl)-2-(pyridin-4-yl)-5,6-dihydrothieno[2,3-h]quinoline (32) as a light y...
null
7b, 2c
4-(Pyridin-3-yl)-2-(pyridin-4-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate, glacial acetic acid
null
glacial acetic acid
31.7
isolated
success
90 °C
14 h
32 mg of product isolated
null
c1cncc(-c2cc(-c3ccncc3)nc3c2CCc2sccc2-3)c1
10,814,067
10814067
The general procedure using workup method B gave 211 mg (94%) of N-(4-Acetylphenyl)-m-toluidine as a yellow solid.
null
null
N-(4-Acetylphenyl)-m-toluidine
null
null
null
94
isolated
success
null
null
211 mg isolated; used workup method B; prepared via general procedure
null
CC(=O)c1ccc(Nc2cccc(C)c2)cc1
32,637,839
32637839
Diethyl aminomalonate hydrochloride S1 (3.62 g, 17.1 mmol) was reacted with benzophenoneimine (3.13 g, 17.1 mmol) in dichloromethane (60 mL) at room temperature for 24 h to give 2-aminomalonate 5a (4.67 g, 80%).
condensation
diethyl aminomalonate hydrochloride, benzophenoneimine
2-aminomalonate 5a
null
null
dichloromethane
80
isolated
success
room temperature
24 h
Argon atmosphere; purified by column chromatography on silica gel (hexane/EtOAc = 10:1).
null
NC(C(=O)[O-])C(=O)[O-]
32,637,839
32637839
Crude 2-aminomalonate (prepared from diethyl aminomalonate hydrochloride S1 and saturated aqueous NaHCO3) was reacted with (MeO)2CNMe2 (4.64 mg, 39.0 mmol) in toluene (60 mL) under reflux for 30 min and then at room temperature for 12 h to give diethyl 2-aminomalonate 5b (6.23 g, 90%).
condensation
2-aminomalonate, (MeO)2CNMe2
diethyl 2-aminomalonate 5b
null
null
toluene
90
isolated
success
reflux
12.5 h
Argon atmosphere; reaction stirred under reflux for 30 min and then at room temperature for 12 h.
null
CCOC(=O)C(/N=C/N(C)C)C(=O)OCC
32,637,839
32637839
Substrates 3, which are 3-amino-4-(2-bromophenyl)-2-pyridones, could be obtained by the conjugate addition of diethyl 2-aminomalonate 5 to alkynyl imines 4 with a bromo group.
conjugate addition
diethyl 2-aminomalonate, alkynyl imines 4
3-amino-4-(2-bromophenyl)-2-pyridones 3
null
null
null
null
null
success
null
null
null
null
Nc1ccc[nH]c1=O
32,637,839
32637839
2,3-disubstituted 4-ethoxycarbonyl-β-carbolin-1-ones 1 could be obtained by the intramolecular amination of 3-amino-4-(2-bromophenyl)-2-pyridones 2.
intramolecular amination
3-amino-4-(2-bromophenyl)-2-pyridones 2
2,3-disubstituted 4-ethoxycarbonyl-β-carbolin-1-ones 1
null
palladium
null
null
null
success
null
null
The synthesis uses palladium-catalyzed intramolecular amination as described in the abstract.
null
O=C1N=CC=C2C1=Nc1ccccc12
31,626,546
31626546
Hydroxycarbonimidic dibromide (4, 8.15 g, 40.2 mmol) was dissolved in CH₂Cl₂ (100 mL), and 2-bromo-3,3,3-trifluoro-1-propene (2, 21.1 g, 121 mmol) and NaHCO₃ (11.1 g, 133 mmol) were added to the vigorously stirred homogeneous solution at rt. The resulting mixture was stirred overnight, yielding 3,5-Dibromo-5-(trifluoro...
cycloaddition
hydroxycarbonimidic dibromide, 2-bromo-3,3,3-trifluoro-1-propene
3,5-Dibromo-5-(trifluoromethyl)-4,5-dihydroisoxazole
NaHCO₃
null
CH₂Cl₂
63
isolated
success
rt
overnight
vigorously stirred homogeneous solution; purified by distillation in vacuo
null
FC(F)(F)C1(Br)CC(Br)=NO1
22,000,119
22000119
The procedure described at Section 4.4 was employed using 6c (0.08 g, 0.35 mmol), dry ammonium acetate (0.27 g, 3.50 mmol), 2c (0.11 g, 0.35 mmol), and dry methanol (2.5 mL) at 95 °C for 14 h to yield 66 mg (56.1%) of 2,4-Di(pyridin-4-yl)-5,6-dihydro-1,10-phenanthroline (20) as a white solid.
null
6c, 2c
2,4-Di(pyridin-4-yl)-5,6-dihydro-1,10-phenanthroline
ammonium acetate
null
methanol
56.1
isolated
success
95 °C
14 h
66 mg isolated; dry ammonium acetate and dry methanol used.
null
c1cnc2c(c1)CCc1c(-c3ccncc3)cc(-c3ccncc3)nc1-2
22,000,119
22000119
A procedure was employed using 7a (0.14 g, 0.60 mmol), dry ammonium acetate (0.46 g, 6.00 mmol), 2c (0.19 g, 0.60 mmol), and glacial acetic acid (1.0 mL) at 100 °C for 20 h to yield 87 mg (42.5%) of 4-(Pyridin-2-yl)-2-(pyridin-4-yl)-5,6-dihydrothieno[2,3-h]quinoline (28) as a light yellow solid.
null
7a, 2c
4-(Pyridin-2-yl)-2-(pyridin-4-yl)-5,6-dihydrothieno[2,3-h]quinoline
ammonium acetate
null
glacial acetic acid
42.5
isolated
success
100 °C
20 h
87 mg isolated
null
c1ccc(-c2cc(-c3ccncc3)nc3c2CCc2sccc2-3)nc1
32,637,839
32637839
Nitrone S3f(28), CuI, DPPE, and K2CO3 in DMF and H2O were reacted with 1-bromo-2-ethynylbenzene S2a at 80 °C for 4 h to give alkynyl imine 4f (834 mg, 70%).
coupling
nitrone S3f(28), 1-bromo-2-ethynylbenzene S2a
(Z)-3-(2-Bromophenyl)-N-(4-chlorophenyl)-1-phenylprop-2-yn-1-imine (4f)
K2CO3, DPPE
CuI
DMF, H2O
70
isolated
success
80 °C
4 h
Reaction performed in a 30 mL two-neck round-bottom flask under an argon balloon.
null
Clc1ccc(/N=C(\C#Cc2ccccc2Br)c2ccccc2)cc1
32,637,839
32637839
Aldehyde S5g and nitroarene S4g were stirred in H2O, EtOH, and NH4Cl at room temperature for 15 min, followed by the addition of Zn powder at 0 °C and stirring at room temperature for 15 h to give nitrone S3g (870 mg, 41%).
nitrone synthesis
aldehyde S5g, nitroarene S4g
(Z)-N-Phenyl-1-(p-tolyl)methanimine Oxide (S3g)
NH4Cl, Zn powder
null
H2O, EtOH
41
isolated
success
rt
15 h
Reaction performed in a 300 mL two-neck round-bottom flask under an argon balloon; Zn powder added at 0 °C.
null
Cc1ccc(/C=[N+](\[O-])c2ccccc2)cc1
22,000,119
22000119
The procedure described at Section 4.4 was employed with 6b (0.07 g, 0.30 mmol), dry ammonium acetate (0.23 g, 3.00 mmol), 2b (0.10 g, 0.30 mmol), and dry methanol (2.0 mL) at 100 °C for 12 h to yield 58 mg (0.17 mmol, 57.5%) of 2,4-Di(Pyridin-3-yl)-5,6-dihydro-1,10-phenanthroline (15) as a white solid.
null
6b, 2b
2,4-Di(Pyridin-3-yl)-5,6-dihydro-1,10-phenanthroline
ammonium acetate
null
methanol
57.5
isolated
success
100 °C
12 h
58 mg isolated; white solid
null
c1cncc(-c2cc(-c3cccnc3)c3c(n2)-c2ncccc2CC3)c1
11,848,747
11848747
The (Z)-propenyl ether (Z)-V reacts to give a quaternary mixture of nitroso acetals in 83% yield.
cycloaddition
(Z)-V
nitroso acetals
null
null
null
83
unspecified
success
null
null
null
The product is described as a quaternary mixture.
C/C=C\O/C=C\C
11,848,747
11848747
With MAPh as the Lewis acid, the lactams formed after hydrogenation are now enriched in the exo diastereomer a.
cycloaddition
(Z)-VI
lactams
null
MAPh
null
null
unspecified
success
null
null
Lactams formed after hydrogenation.
The reaction produces an enrichment in the exo diastereomer a.
[CH3][Al]([O]c1c(-c2ccccc2)cccc1-c1ccccc1)[O]c1c(-c2ccccc2)cccc1-c1ccccc1
11,848,747
11848747
The full evaluation of 2,2-diphenylcyclopentanol as an auxiliary is seen in the examination of (E)-propenyl ether (E)-VI in the test cycloaddition with both Lewis acids... With MAPh as the promoter, the nitroso acetals are formed in 83% yield.
cycloaddition
(E)-VI
nitroso acetals
null
MAPh
null
83
unspecified
success
null
null
Product formed as a mixture of two diastereomers in a ratio of 7/1.
null
[CH3][Al]([O]c1c(-c2ccccc2)cccc1-c1ccccc1)[O]c1c(-c2ccccc2)cccc1-c1ccccc1
32,637,839
32637839
3-amino-2-pyridone 2a (48.9 mg, 0.100 mmol) in degassed 1,4-dioxane (2 mL) was reacted with Pd2(dba)3 (2.3 mg, 0.0025 mmol), SPhos (3.1 mg, 0.0075 mmol), and NaOtBu (19.2 mg, 0.200 mmol) under reflux for 4 h to give β-carbolin-1-one 1a (33.1 mg, 83%).
intramolecular amination
3-amino-2-pyridone 2a
Ethyl 1-Oxo-2,3-diphenyl-2,9-dihydro-1H-pyrido[3,4-b]indole-4-carboxylate
NaOtBu, SPhos
Pd2(dba)3
1,4-dioxane
83
isolated
success
reflux
4 h
argon balloon, degassed solvent
null
CCOC(=O)c1c(-c2ccccc2)n(-c2ccccc2)c(=O)c2[nH]c3ccccc3c12
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Chemical Reaction Extraction Task

Starling query: Find all reactions within PubMed.

Schema Specification

reaction_type

  • Type: string
  • Description: Type of reaction (e.g., Suzuki coupling, hydrogenation, oxidation, reduction, alkylation, acylation, condensation, cycloaddition)

reactants

  • Type: string
  • Description: All reactants/substrates whose atoms end up in the product, comma-separated. Do NOT include reagents, bases, catalysts, or solvents.

product

  • Type: string
  • Description: Primary product, name as written in the paper.

reagent

  • Type: string
  • Description: Bases, stoichiometric reagents, ligands, and additives — comma-separated (e.g., 'K2CO3, XPhos, TBAI'). Not catalysts or solvents. Null if none.

catalyst

  • Type: string
  • Description: Catalyst or catalytic system (e.g., 'Pd(PPh3)4', '10% Pd/C', 'Grubbs II', 'CuI', 'PPTS', 'TiCl4'). Include Lewis acids, phase-transfer catalysts, and organocatalysts. Only exclude stoichiometric reagents like NaBH4 or bases like K2CO3 (those go in reagent). Null if no catalyst.

solvent

  • Type: string
  • Description: Reaction solvent(s), comma-separated. Not workup solvents. Null if not reported.

yield_percent

  • Type: number
  • Description: Yield in percent (0 for failed reactions). Null only if not reported at all.

yield_type

  • Type: string
  • Description: How yield was measured.
  • Allowed values:
    • isolated
    • GC
    • NMR
    • LCMS
    • HPLC
    • crude
    • quantitative
    • unspecified

outcome_status

  • Type: string
  • Description: Reaction outcome.
  • Allowed values:
    • success
    • failed
    • trace
    • no_reaction
    • decomposition

temperature

  • Type: string
  • Description: Reaction temperature with units (e.g., '80 °C', 'reflux', 'rt', '-78 °C'). If multiple stages, list the main reaction temperature. Null if not reported.

reaction_time

  • Type: string
  • Description: Reaction duration (e.g., '2 h', '30 min', 'overnight'). Null if not reported.

setup_and_notes

  • Type: string
  • Description: Atmosphere (N2, Ar, air), pressure, scale, concentration, equivalents, vessel, and any other relevant conditions not captured above. Null if nothing to add.
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