2-Methylimidazo[1,2-a]pyridine-3-carboxylic acid

Modify Date: 2025-08-24 20:55:57

2-Methylimidazo[1,2-a]pyridine-3-carboxylic acid Structure
2-Methylimidazo[1,2-a]pyridine-3-carboxylic acid structure
Common Name 2-Methylimidazo[1,2-a]pyridine-3-carboxylic acid
CAS Number 21801-79-6 Molecular Weight 176.172
Density 1.4±0.1 g/cm3 Boiling Point 170ºC
Molecular Formula C9H8N2O2 Melting Point 140ºC
MSDS USA Flash Point N/A

 Names

Name 2-Methylimidazo[1,2-a]pyridine-3-carboxylic acid
Synonym More Synonyms

 Chemical & Physical Properties

Density 1.4±0.1 g/cm3
Boiling Point 170ºC
Melting Point 140ºC
Molecular Formula C9H8N2O2
Molecular Weight 176.172
Exact Mass 176.058578
PSA 54.60000
LogP 1.90
Index of Refraction 1.653
InChIKey FBIUGCLQMKPURJ-UHFFFAOYSA-N
SMILES Cc1nc2ccccn2c1C(=O)O

 MSDS

Name: 2-Methylimidazo[1 2-a]pyridine-3-carboxylic acid 97% Material Safety Data Sheet
Synonym:
CAS: 21801-79-6
Section 1 - Chemical Product MSDS Name:2-Methylimidazo[1 2-a]pyridine-3-carboxylic acid 97% Material Safety Data Sheet
Synonym:

Section 2 - COMPOSITION, INFORMATION ON INGREDIENTS
CAS# Chemical Name content EINECS#
21801-79-6 2-Methylimidazo[1,2-a]pyridine-3-carbo 97% unlisted
Hazard Symbols: XI
Risk Phrases: 36/37/38

Section 3 - HAZARDS IDENTIFICATION
EMERGENCY OVERVIEW
Irritating to eyes, respiratory system and skin.
Potential Health Effects
Eye:
Causes eye irritation.
Skin:
Causes skin irritation. May be harmful if absorbed through the skin.
Ingestion:
May cause irritation of the digestive tract. May be harmful if swallowed.
Inhalation:
Causes respiratory tract irritation. May be harmful if inhaled.
Chronic:
Not available.

Section 4 - FIRST AID MEASURES
Eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.
Skin:
Get medical aid. Flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes.
Ingestion:
Get medical aid. Wash mouth out with water.
Inhalation:
Remove from exposure and move to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Notes to Physician:
Treat symptomatically and supportively.

Section 5 - FIRE FIGHTING MEASURES
General Information:
As in any fire, wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear.
Extinguishing Media:
Use water spray, dry chemical, carbon dioxide, or chemical foam.

Section 6 - ACCIDENTAL RELEASE MEASURES
General Information: Use proper personal protective equipment as indicated in Section 8.
Spills/Leaks:
Vacuum or sweep up material and place into a suitable disposal container.

Section 7 - HANDLING and STORAGE
Handling:
Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.
Storage:
Store in a cool, dry place. Store in a tightly closed container.

Section 8 - EXPOSURE CONTROLS, PERSONAL PROTECTION
Engineering Controls:
Facilities storing or utilizing this material should be equipped with an eyewash facility and a safety shower. Use adequate ventilation to keep airborne concentrations low.
Exposure Limits CAS# 21801-79-6: Personal Protective Equipment Eyes: Not available.
Skin:
Wear appropriate protective gloves to prevent skin exposure.
Clothing:
Wear appropriate protective clothing to prevent skin exposure.
Respirators:
Follow the OSHA respirator regulations found in 29 CFR 1910.134 or European Standard EN 149. Use a NIOSH/MSHA or European Standard EN 149 approved respirator if exposure limits are exceeded or if irritation or other symptoms are experienced.

Section 9 - PHYSICAL AND CHEMICAL PROPERTIES

Physical State: Solid
Color: off-white
Odor: Not available.
pH: Not available.
Vapor Pressure: Not available.
Viscosity: Not available.
Boiling Point: Not available.
Freezing/Melting Point: 177 - 179 deg C
Autoignition Temperature: Not available.
Flash Point: Not available.
Explosion Limits, lower: Not available.
Explosion Limits, upper: Not available.
Decomposition Temperature:
Solubility in water:
Specific Gravity/Density:
Molecular Formula: C9H8N2O2
Molecular Weight: 176.17

Section 10 - STABILITY AND REACTIVITY
Chemical Stability:
Not available.
Conditions to Avoid:
Incompatible materials.
Incompatibilities with Other Materials:
Strong oxidizing agents.
Hazardous Decomposition Products:
Nitrogen oxides, carbon monoxide, carbon dioxide.
Hazardous Polymerization: Has not been reported

Section 11 - TOXICOLOGICAL INFORMATION
RTECS#:
CAS# 21801-79-6: NJ5495000 LD50/LC50:
Not available.
Carcinogenicity:
2-Methylimidazo[1,2-a]pyridine-3-carboxylic acid - Not listed by ACGIH, IARC, or NTP.
Other:
See actual entry in RTECS for complete information.

Section 12 - ECOLOGICAL INFORMATION


Section 13 - DISPOSAL CONSIDERATIONS
Dispose of in a manner consistent with federal, state, and local regulations.

Section 14 - TRANSPORT INFORMATION

IATA
No information available.
IMO
No information available.
RID/ADR
No information available.

Section 15 - REGULATORY INFORMATION

European/International Regulations
European Labeling in Accordance with EC Directives
Hazard Symbols: XI
Risk Phrases:
R 36/37/38 Irritating to eyes, respiratory system
and skin.
Safety Phrases:
S 26 In case of contact with eyes, rinse immediately
with plenty of water and seek medical advice.
S 37/39 Wear suitable gloves and eye/face
protection.
WGK (Water Danger/Protection)
CAS# 21801-79-6: No information available.
Canada
None of the chemicals in this product are listed on the DSL/NDSL list.
CAS# 21801-79-6 is not listed on Canada's Ingredient Disclosure List.
US FEDERAL
TSCA
CAS# 21801-79-6 is not listed on the TSCA inventory.
It is for research and development use only.


SECTION 16 - ADDITIONAL INFORMATION
N/A

 Toxicological Information

CHEMICAL IDENTIFICATION

RTECS NUMBER :
NJ5495000
CHEMICAL NAME :
Imidazo(1,2-a)pyridine-3-carboxylic acid, 2-methyl-
CAS REGISTRY NUMBER :
21801-79-6
BEILSTEIN REFERENCE NO. :
0155092
LAST UPDATED :
199612
DATA ITEMS CITED :
1
MOLECULAR FORMULA :
C9-H8-N2-O2
MOLECULAR WEIGHT :
176.19
WISWESSER LINE NOTATION :
T56 AN DNJ BVQ C1

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
600 mg/kg
TOXIC EFFECTS :
Behavioral - convulsions or effect on seizure threshold Behavioral - muscle contraction or spasticity Behavioral - irritability
REFERENCE :
JMCMAR Journal of Medicinal Chemistry. (American Chemical Soc., Distribution Office Dept. 223, POB POB 57136, West End Stn., Washington, DC 20037) V.6- 1963- Volume(issue)/page/year: 12,122,1969

 Safety Information

Hazard Codes Xi: Irritant;
Risk Phrases R36/37/38
Safety Phrases 26-36/37/39
HS Code 2933990090

 Synthetic Route

~45%

2-Methylimidazo[1,2-a]pyridine-3-carboxylic acid Structure

2-Methylimidazo...

CAS#:21801-79-6

Literature: MILLENNIUM PHARMACEUTICALS, INC.; TAKEDA PHARMACEUTICAL COMPANY LIMITED; BANNO, Hiroshi; HIROSE, Masaaki; KURASAWA, Osamu; LANGSTON, Steven, P.; MIZUTANI, Hirotake; SHI, Zhan; VISIERS, Irache; VOS, Tricia, J.; VYSKOCIL, Stepan Patent: WO2010/90716 A1, 2010 ; Location in patent: Page/Page column 321 ;

~96%

2-Methylimidazo[1,2-a]pyridine-3-carboxylic acid Structure

2-Methylimidazo...

CAS#:21801-79-6

Literature: Kuemmerle, Arthur E.; Schmitt, Martine; Cardozo, Suzana V. S.; Lugnier, Claire; Villa, Pascal; Lopes, Alexandra B.; Romeiro, Nelilma C.; Justiniano, Helene; Martins, Marco A.; Fraga, Carlos A. M.; Bourguignon, Jean-Jacques; Barreiro, Eliezer J. Journal of Medicinal Chemistry, 2012 , vol. 55, # 17 p. 7525 - 7545

~%

2-Methylimidazo[1,2-a]pyridine-3-carboxylic acid Structure

2-Methylimidazo...

CAS#:21801-79-6

Literature: Journal of the American Chemical Society, , vol. 76, p. 1845

~%

2-Methylimidazo[1,2-a]pyridine-3-carboxylic acid Structure

2-Methylimidazo...

CAS#:21801-79-6

Literature: Journal of the American Chemical Society, , vol. 76, p. 1845

~%

2-Methylimidazo[1,2-a]pyridine-3-carboxylic acid Structure

2-Methylimidazo...

CAS#:21801-79-6

Literature: Bioorganic and Medicinal Chemistry Letters, , vol. 22, # 5 p. 1870 - 1873

~%

2-Methylimidazo[1,2-a]pyridine-3-carboxylic acid Structure

2-Methylimidazo...

CAS#:21801-79-6

Literature: Journal of Chemical Research, , vol. 35, # 4 p. 243 - 245

 Customs

HS Code 2933990090
Summary 2933990090. heterocyclic compounds with nitrogen hetero-atom(s) only. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

 Synonyms

Imidazo[1,2-a]pyridine-3-carboxylic acid, 2-methyl-
2-Methylimidazo[1,2-a]pyridine-3-carboxylic acid
MFCD00244615
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