6-Chloro-5-methylpyridazin-3(2H)-one

Name: 6-Chloro-5-methylpyridazin-3(2H)-one
Brand: ChemScene
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CAS No. 1703-07-7
Cat. No. CS-W019006
Purity≥95%
MDL No.None

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Type	HazMat Fee
Excepted Quantity	$0.00
FedEx Limited Quantities Ground	$0.00
Hazmat Ground shipping	$50.00+
Inaccessible (Haz class 6.1 or 9), Domestic	$68.00+
Accessible (Haz class 3, 4, 5 or 8), Domestic	$158.00+
Inaccessible (Haz class 6.1 or 9), International	$108.00+
Accessible (Haz class 3, 4, 5 or 8), International	$238.00+

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6-Chloro-5-methylpyridazin-3(2H)-one|CS-W019006

Structure of 1703-07-7

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General Information

CAS No. 1703-07-7
Cat. No. CS-W019006
Purity ≥95%
MDL No. None
Storage 4°C
Shipping Room temperature in continental US; may vary elsewhere.
Molecular Formula C₅H₅ClN₂O
Molecular Weight 144.56
Synonym(s) 6-chloro-5-methyl-2H-pyridazin-3-one
SMILES O=C1C=C(C)C(Cl)=NN1

Description

6-Chloro-5-methylpyridazin-3(2H)-one features a fused heterocyclic core with orthogonal electron-withdrawing and electron-donating substituents, enabling selective reactivity in transition-metal-catalyzed couplings. The chloro group serves as a robust handle for cross-coupling transformations, while the methyl moiety enhances solubility and modulates electronic properties. This scaffold demonstrates stability under standard bench conditions and integrates efficiently into complex molecular architectures.

Application

6-Chloro-5-methylpyridazin-3(2H)-one serves as a versatile building block in medicinal chemistry, enabling efficient access to substituted pyridazinones via palladium-catalyzed cross-coupling reactions. The chloro group facilitates nucleophilic substitution under mild conditions, while the methyl and lactam functionalities provide orthogonal reactivity for downstream derivatization. This compound exhibits excellent bench stability and is compatible with common purification methods, making it well-suited for high-throughput synthesis of bioactive heterocycles.

Safety Information

Download SDS

GHS Pictogram :	GHS No : GHS07
Signal Word : Warning	UN#: N/A
Class : N/A	Packing Group : N/A
Hazard Statements : H302-H315-H319-H335
Precautionary Statements : P261-P264-P270-P271-P280-P302+P352-P304+P340-P305+P351+P338-P330-P362+P364-P403+P233-P405-P501

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Computational Chemistry Data

TPSA 45.75
LogP 0.73172
H_Acceptors 2
H_Donors 1
Rotatable_Bonds 0

Other Classifications

Building Blocks Skeleton Aromatic heterocycle compounds Pyridazine compounds

Key Words

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6-Chloro-5-methylpyridazin-3(2H)-one

CAS No. 1703-07-7

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