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1,2,4-Triazolo[4,3-a]pyridin-3(2H)-one
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Name

1,2,4-Triazolo[4,3-a]pyridin-3(2H)-one

 EINECS 230-191-8
CAS No. 6969-71-7 Density 1.511 g/cm3
PSA 50.16000 LogP 0.02260
Solubility N/A Melting Point 231 °C
Formula C6H5N3O Boiling Point N/A
Molecular Weight 135.125 Flash Point N/A
Transport Information N/A Appearance Powder
Safety 26-36 Risk Codes 36/37/38
Molecular Structure Molecular Structure of 6969-71-7 (1,2,4-Triazolo[4,3-a]pyridin-3(2H)-one) Hazard Symbols R36/37/38:;
Synonyms

s-Triazolo[4,3-a]pyridin-3-ol(6CI,7CI,8CI);3-Hydroxytriazolo[4,3-a]pyridine;NSC 68462;

Article Data 15

1,2,4-Triazolo[4,3-a]pyridin-3(2H)-one Synthetic route

N'-(pyridin-2-yl)formic hydrazide

6969-71-7

[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Conditions
ConditionsYield
In N,N-dimethyl-formamide at 140℃; for 24h; Reagent/catalyst; Temperature; Solvent; Schlenk technique; Sealed tube;81%
4930-98-7

pyrid-2-ylhydrazine

57-13-6

urea

6969-71-7

[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Conditions
ConditionsYield
In neat (no solvent) for 0.0138889h; Microwave irradiation;75%
at 200℃; for 2h; Cyclization;57%
at 130℃; for 3h;15%
at 120 - 160℃; for 4h; Temperature;
N'-(pyridin-2-yl)formic hydrazide

N'-(pyridin-2-yl)formic hydrazide

6969-71-7

[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Conditions
ConditionsYield
In N,N-dimethyl-formamide at 140℃; for 24h; Reagent/catalyst; Temperature; Solvent; Schlenk technique; Sealed tube;81%
4231-61-2

2-benzyl-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

6969-71-7

[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Conditions
ConditionsYield
With trifluorormethanesulfonic acid In toluene at 150℃; for 0.25h; Microwave irradiation;72%
4930-98-7

pyrid-2-ylhydrazine

57-13-6

urea

6969-71-7

[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Conditions
ConditionsYield
In neat (no solvent) for 0.0138889h; Microwave irradiation;75%
at 200℃; for 2h; Cyclization;57%
at 130℃; for 3h;15%
at 120 - 160℃; for 4h; Temperature;
4231-61-2

2-benzyl-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

6969-71-7

[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Conditions
ConditionsYield
With trifluorormethanesulfonic acid In toluene at 150℃; for 0.25h; Microwave irradiation;72%
109-09-1

2-chloropyridine

563-41-7

semicarbazide hydrochloride

6969-71-7

[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Conditions
ConditionsYield
With sulfuric acid In 2-ethoxy-ethanol for 24h; Reflux;51%
With sulfuric acid In 2-ethoxy-ethanol for 0.0333333h; Microwave irradiation;48%
With sulfuric acid In 2-ethoxy-ethanol; water35.0 g (59%)
109-09-1

2-chloropyridine

563-41-7

semicarbazide hydrochloride

6969-71-7

[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Conditions
ConditionsYield
With sulfuric acid In 2-ethoxy-ethanol for 24h; Reflux;51%
With sulfuric acid In 2-ethoxy-ethanol for 0.0333333h; Microwave irradiation;48%
With sulfuric acid In 2-ethoxy-ethanol; water35.0 g (59%)
109-89-7

diethylamine

51330-53-1

1-acetyl-1,2,4-triazolo<4,3-a>pyridinium-3-olate

A

685-91-6

diethylacetamide

B

6969-71-7

[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Conditions
ConditionsYield
In tetrahydrofuran at 25℃; Rate constant;
109-89-7

diethylamine

51330-53-1

1-acetyl-1,2,4-triazolo<4,3-a>pyridinium-3-olate

A

685-91-6

diethylacetamide

B

6969-71-7

[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Conditions
ConditionsYield
In tetrahydrofuran at 25℃; Rate constant;

1,2,4-Triazolo[4,3-a]pyridin-3(2H)-one Specification

The 1,2,4-Triazolo[4,3-a]pyridin-3(2H)-one is an organic compound with the formula C6H5N3O. The IUPAC name of this chemical is 2H-[1,2,4]triazolo[4,3-a]pyridin-3-one. With the CAS registry number 6969-71-7 and EINECS 230-191-8, it is also named as 3-Hydroxytriazolo[4,3-a]pyridine. The product's categories are APIs & Intermediate; Pyrimidine; Pyridines; Fused Ring Systems. It is pale yellow crystalline powder which is used as pharmaceutical intermediate.

The other characteristics of this product can be summarized as: (1)# of Rule of 5 Violations: 0; (2)ACD/BCF (pH 5.5): 1; (3)ACD/BCF (pH 7.4): 1; (4)ACD/KOC (pH 5.5): 18.995; (5)ACD/KOC (pH 7.4): 14.175; (6)#H bond acceptors: 4; (7)#H bond donors: 1; (8)#Freely Rotating Bonds: 0; (9)Polar Surface Area: 44.7 Å2; (10)Index of Refraction: 1.739; (11)Molar Refractivity: 36.01 cm3; (12)Molar Volume: 89.418 cm3; (13)Polarizability: 14.276×10-24 cm3; (14)Surface Tension: 66.89 dyne/cm; (15)Density: 1.511 g/cm3; (16)Tautomer Count: 2; (17)Exact Mass: 135.043262; (18)MonoIsotopic Mass: 135.043262; (19)Topological Polar Surface Area: 44.7; (20)Heavy Atom Count: 10; (21)Complexity: 264.

Preparation of 1,2,4-Triazolo[4,3-a]pyridin-3(2H)-one: It can be obtained by 2-hydrazino-pyridine and urea. This reaction is a kind of cyclization at temperature of 200 °C. The reaction time is 2 hours. The yield is 57%.

1,2,4-Triazolo[4,3-a]pyridin-3(2H)-one can be obtained by 2-hydrazino-pyridine and urea

Uses of 1,2,4-Triazolo[4,3-a]pyridin-3(2H)-one: It can react with carbonochloridic acid ethyl ester to get 1-Ethoxycarbonyl-3-oxy-sym.-triazolo[4,3-a]pyridin. This reaction needs heating. The reaction time is 3 hours and the yield is 71%.

1,2,4-Triazolo[4,3-a]pyridin-3(2H)-one can react with carbonochloridic acid ethyl ester to get 1-Ethoxycarbonyl-3-oxy-sym.-triazolo[4,3-a]pyridin

When you are using this chemical, please be cautious about it as the following:
It is irritating to eyes, respiratory system and skin. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. If you want to contact this product, you must wear suitable protective clothing.

People can use the following data to convert to the molecule structure. 
1. SMILES:c1ccn2c(c1)n[nH]c2=O
2. InChI:InChI=1/C6H5N3O/c10-6-8-7-5-3-1-2-4-9(5)6/h1-4H,(H,8,10)
3. InChIKey:LJRXNXBFJXXRNQ-UHFFFAOYAU

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