Welcome to the BenchChem Online Store!
molecular formula C6H3BrClI B1333647 4-Bromo-2-chloro-1-iodobenzene CAS No. 31928-47-9

4-Bromo-2-chloro-1-iodobenzene

Cat. No. B1333647
M. Wt: 317.35 g/mol
InChI Key: OHHKQBZOURGNLR-UHFFFAOYSA-N
Attention: For research use only. Not for human or veterinary use.
In Stock
  • Click on QUICK INQUIRY to receive a quote from our team of experts.
  • With the quality product at a COMPETITIVE price, you can focus more on your research.
Patent
US08383832B2

Procedure details

To a stirred mixture of 6-amino-7-fluoro-3-methyl-3H-benzoimidazole-5-carboxylic acid methyl ester (6) (8.00 g, 34.16 mmol) and cesium carbonate (22.48 g, 68.31 mmol) in anhydrous anisole (76 mL) under nitrogen was added 4-bromo-2-chloroiodobenzene (1.60 g, 1.10 equiv., 4.88 mmol). The preformed catalyst, as prepared above, was then added to the mixture to provide a dark brown suspension, which was heated at 100±2° C., with stirring at 350 rpm. The reaction was monitored by HPLC analysis. After 41 hours, no 6-amino-7-fluoro-3-methyl-3H-benzoimidazole-5-carboxylic acid methyl ester (6) remained. The reaction mixture was cooled to about 80° C. and 1M sulfuric acid (40.99 mL 40.99 mmol) was added. Gas evolution was observed after 10 minutes and the rate of addition was controlled to moderate the effervescence. At the end of the addition the pH was between 7 and 8. Additional sulfuric acid (1M, 10.25 mL, 10.25 mmol) was then added to give mobile slurry with a pH of 0. The mixture was diluted with anisole (20 mL) and Celatom FW-14 filter agent was added. It was then filtered at about 80° C. through a water-wet pad of Celatom FW-14 filter agent and the cake was washed with anisole (1×40 mL+3×20 mL), then water (10 mL). The lower aqueous layer was separated and discarded and the organic layer was washed with 10% aqueous NaCl solution (2×40 mL). This was added to a sodium hydroxide (5.46 g, 68.3 mmol) in methanol (24 mL) and the mixture was heated at 65° C. with stirring. After 17.5 hours HPLC analysis indicated that the hydrolysis of the ester was complete and the slurry was cooled to 15° C., then filtered on a sinter. The solid was washed with water (4×24 mL), MTBE (24 mL), and acetonitrile (2×25 mL) and then dried at 45° C. in a vacuum oven to provide 11.07 g of 6-(4-bromo-2-chlorophenylamino)-7-fluoro-3-methyl-3H-benzoimidazole-5-carboxylic acid (7) as a fine pale brown solid (assay 93.7% by 1H NMR), actual wt 10.37 g (72.2% yield). 1H NMR (400 MHz, d6 DMSO) δ 3.85 (3H, s, NMe), 6.53 (1H, dd, J 9, 7, Ar—H), 7.27 (1H, dd, J 9, 2.5, Ar—H), 7.56 (1H, d, J 9, Ar—H), 7.97 (1H, s, Ar—H), 8.20 (1H, s, Ar—H), 11.5 (1H, s, CO2H). 13C NMR (100 MHz, d6 DMSO) δ 31 (CH3), 108 (CH, d, J 2), 109 (CH), 117 (C, d, J 6), 122 (C), 124 (C, d, J 7), 127 (C), 130 (C), 131 (C), 132 (C, d, J 9), 133 (C, d, J 11), 141 (C), 145 (CF, d, J 252), 146 (CH), 170 (C═O).
Quantity
20 mL
Type
solvent
Reaction Step One
Name
cesium carbonate
Quantity
22.48 g
Type
reactant
Reaction Step Two
Quantity
76 mL
Type
solvent
Reaction Step Two
Quantity
1.6 g
Type
reactant
Reaction Step Three
Quantity
0 (± 1) mol
Type
reactant
Reaction Step Four
Quantity
40.99 mL
Type
reactant
Reaction Step Five
Quantity
10.25 mL
Type
reactant
Reaction Step Six
Quantity
5.46 g
Type
reactant
Reaction Step Seven
Quantity
24 mL
Type
solvent
Reaction Step Seven
[Compound]
Name
ester
Quantity
0 (± 1) mol
Type
reactant
Reaction Step Eight

Identifiers

REACTION_CXSMILES
C[O:2][C:3]([C:5]1[C:14]([NH2:15])=[C:13]([F:16])[C:8]2[N:9]=[CH:10][N:11]([CH3:12])[C:7]=2[CH:6]=1)=[O:4].C(=O)([O-])[O-].[Cs+].[Cs+].[Br:23][C:24]1[CH:29]=[CH:28][C:27](I)=[C:26]([Cl:31])[CH:25]=1.S(=O)(=O)(O)O.[OH-].[Na+]>C1(OC)C=CC=CC=1.CO>[Br:23][C:24]1[CH:29]=[CH:28][C:27]([NH:15][C:14]2[C:5]([C:3]([OH:2])=[O:4])=[CH:6][C:7]3[N:11]([CH3:12])[CH:10]=[N:9][C:8]=3[C:13]=2[F:16])=[C:26]([Cl:31])[CH:25]=1 |f:1.2.3,6.7|

Inputs

Step One
Name
Quantity
20 mL
Type
solvent
Smiles
C1(=CC=CC=C1)OC
Step Two
Name
Quantity
8 g
Type
reactant
Smiles
COC(=O)C1=CC2=C(N=CN2C)C(=C1N)F
Name
cesium carbonate
Quantity
22.48 g
Type
reactant
Smiles
C([O-])([O-])=O.[Cs+].[Cs+]
Name
Quantity
76 mL
Type
solvent
Smiles
C1(=CC=CC=C1)OC
Step Three
Name
Quantity
1.6 g
Type
reactant
Smiles
BrC1=CC(=C(C=C1)I)Cl
Step Four
Name
Quantity
0 (± 1) mol
Type
reactant
Smiles
COC(=O)C1=CC2=C(N=CN2C)C(=C1N)F
Step Five
Name
Quantity
40.99 mL
Type
reactant
Smiles
S(O)(O)(=O)=O
Step Six
Name
Quantity
10.25 mL
Type
reactant
Smiles
S(O)(O)(=O)=O
Step Seven
Name
Quantity
5.46 g
Type
reactant
Smiles
[OH-].[Na+]
Name
Quantity
24 mL
Type
solvent
Smiles
CO
Step Eight
Name
ester
Quantity
0 (± 1) mol
Type
reactant
Smiles

Conditions

Temperature
Control Type
UNSPECIFIED
Setpoint
100 (± 2) °C
Stirring
Type
CUSTOM
Details
with stirring at 350 rpm
Rate
UNSPECIFIED
RPM
0
Other
Conditions are dynamic
1
Details
See reaction.notes.procedure_details.

Workups

CUSTOM
Type
CUSTOM
Details
The preformed catalyst, as prepared above,
ADDITION
Type
ADDITION
Details
was then added to the mixture
CUSTOM
Type
CUSTOM
Details
to provide a dark brown suspension, which
TEMPERATURE
Type
TEMPERATURE
Details
The reaction mixture was cooled to about 80° C.
WAIT
Type
WAIT
Details
Gas evolution was observed after 10 minutes
Duration
10 min
ADDITION
Type
ADDITION
Details
the rate of addition
ADDITION
Type
ADDITION
Details
At the end of the addition the pH was between 7 and 8
CUSTOM
Type
CUSTOM
Details
to give mobile slurry with a pH of 0
FILTRATION
Type
FILTRATION
Details
filter agent
ADDITION
Type
ADDITION
Details
was added
FILTRATION
Type
FILTRATION
Details
It was then filtered at about 80° C. through a water-wet pad of Celatom FW-14
FILTRATION
Type
FILTRATION
Details
filter agent
WASH
Type
WASH
Details
the cake was washed with anisole (1×40 mL+3×20 mL)
CUSTOM
Type
CUSTOM
Details
The lower aqueous layer was separated
WASH
Type
WASH
Details
the organic layer was washed with 10% aqueous NaCl solution (2×40 mL)
TEMPERATURE
Type
TEMPERATURE
Details
the mixture was heated at 65° C.
STIRRING
Type
STIRRING
Details
with stirring
TEMPERATURE
Type
TEMPERATURE
Details
the slurry was cooled to 15° C.
FILTRATION
Type
FILTRATION
Details
filtered on a sinter
WASH
Type
WASH
Details
The solid was washed with water (4×24 mL), MTBE (24 mL), and acetonitrile (2×25 mL)
CUSTOM
Type
CUSTOM
Details
dried at 45° C. in a vacuum oven

Outcomes

Product
Details
Reaction Time
41 h
Name
Type
product
Smiles
BrC1=CC(=C(C=C1)NC=1C(=CC2=C(N=CN2C)C1F)C(=O)O)Cl
Measurements
Type Value Analysis
AMOUNT: MASS 11.07 g
YIELD: PERCENTYIELD 72.2%
YIELD: CALCULATEDPERCENTYIELD 569.1%

Source

Source
Open Reaction Database (ORD)
Description
The Open Reaction Database (ORD) is an open-access schema and infrastructure for structuring and sharing organic reaction data, including a centralized data repository. The ORD schema supports conventional and emerging technologies, from benchtop reactions to automated high-throughput experiments and flow chemistry. Our vision is that a consistent data representation and infrastructure to support data sharing will enable downstream applications that will greatly improve the state of the art with respect to computer-aided synthesis planning, reaction prediction, and other predictive chemistry tasks.
© Copyright 2024 BenchChem. All Rights Reserved.