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ChemicalBook CAS DataBase List 5-BROMO-1H-PYRAZO[3,4-B]PYRIDINE
875781-17-2

5-BROMO-1H-PYRAZO[3,4-B]PYRIDINE synthesis

5synthesis methods
875781-15-0 Synthesis
5-Bromo-2-fluoropyridine-3-carboxaldehyde

875781-15-0
180 suppliers
$6.00/1g

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Yield:875781-17-2 46%

Reaction Conditions:

with hydrazine in ethanolHeating / reflux;

Steps:

D-1
Preparation of 5-bromo-1H-pyrazolo[3,4-b]pyridine (D-1-3). D-1-2 D"1-3A solution of compound D-1-2 (20 g, 0.1 mol) and anhydrous hydrazine (18 g, 0.56 mol) in ethanol was heated to reflux overnight. TLC (petroleum ether/EtOAc 2:1 ) indicated complete consumption of starting material. The reaction mixture was concentrated in vacuo to a volume of about 50 ml_ and poured into water (500 ml_), the resulting mixture was filtered. The cake was washed with water (50 ml_χ3) and ether (20 ml_χ3), then dried in vacuo to yield compound D-1-3 (9.0 g, 46%) as a yellow solid.

References:

PFIZER INC. WO2009/16460, 2009, A2 Location in patent:Page/Page column 99-100

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2065-75-0 Synthesis
2-Bromomalonaldehyde

2065-75-0
328 suppliers
$6.00/5g

1225387-53-0 Synthesis
1H-Pyrazol-5-amine

1225387-53-0
61 suppliers
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