3-Bromo-4-fluoro-1H-pyrazole

Name: 3-Bromo-4-fluoro-1H-pyrazole
Brand: ChemScene
Availability: InStock
Rating: 5 (1 reviews)

CAS No. 1621526-49-5
Cat. No. CS-0184172
Purity≥97%
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+

An item is classified as a dangerous good if our website displays Hazardous Material (HazMat) information for it.

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Structure of 1621526-49-5

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Description

3-Bromo-4-fluoro-1H-pyrazole is a halogenated heterocycle featuring complementary electrophilic (bromine) and nucleophilic (fluorine) sites. This electron-deficient scaffold enables selective cross-coupling reactions and serves as a key building block in medicinal chemistry, particularly for constructing bioactive molecules with enhanced metabolic stability and target specificity.

Application

3-Bromo-4-fluoro-1H-pyrazole serves as a versatile building block for the synthesis of functionalized heterocycles, enabling palladium-catalyzed cross-coupling reactions with high regioselectivity. The bromo and fluoro substituents provide orthogonal reactivity for sequential derivatization, while the pyrazole core offers stability under standard reaction conditions. This compound facilitates efficient access to medicinally relevant scaffolds in drug discovery workflows.

General Information

CAS No. 1621526-49-5
Cat. No. CS-0184172
Purity ≥97%
MDL No. None
Storage 4°C
Shipping Room temperature in continental US; may vary elsewhere.
Molecular Formula C₃H₂BrFN₂
Molecular Weight 164.96
Synonym(s) None
SMILES FC1=CNN=C1Br

Computational Chemistry Data

TPSA 28.68
LogP 1.3113
H_Acceptors 1
H_Donors 1
Rotatable_Bonds 0

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-P280-P302+P352

Quality Control

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Other Classifications

Building Blocks Functional Group Bromide

Building Blocks Skeleton Aromatic heterocycle compounds Pyrazole compounds

Key Words

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3-Bromo-4-fluoro-1H-pyrazole

CAS No. 1621526-49-5

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