ChemicalBook CAS DataBase List METHYL 6-CHLOROPYRIDAZINE-3-CARBOXYLATE

METHYL 6-CHLOROPYRIDAZINE-3-CARBOXYLATE synthesis

14synthesis methods

Product Name:METHYL 6-CHLOROPYRIDAZINE-3-CARBOXYLATE
CAS Number:65202-50-8
Molecular formula:C6H5ClN2O2
Molecular Weight:172.57

67-56-1 Synthesis

67-56-1
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$7.29/5ml-f

5096-73-1 Synthesis

5096-73-1
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$15.00/1g

65202-50-8
175 suppliers
$21.21/1gm:

Yield:65202-50-8 88.2%

Reaction Conditions:

Stage #1:6-chloro-pyridazine-3-carboxylic acid with oxalyl dichloride;N,N-dimethyl-formamide in dichloromethane at 0 - 20; for 1 h;
Stage #2:methanol in dichloromethane at 20; for 1 h;

Steps:

1.11; 1.13
Oxalyl chloride (1 equiv.) was added dropwise to a solution of 6-chloro-3- pyridazinecarboxylic acid (1.000 g, 6.308 mmol) in dry DCM (30 mL) and dry DMF (1 drop) at 0 °C and the mixture stirred at this temperature for 1 h. The solvent was removed in vacuo and the residue redissolved in dry DCM. MeOH (1 equiv.) were added and the mixture stirred at rt for a further 1 h. The mixture was quenched with H₂O (20 mL) and extracted with DCM (2 x 20 mL). The combined organic layers were then dried over MgSO₄and concentrated to give methyl 6-chloropyridazine-3-carboxylate as a white solid. (0.960 g, 88.2% yield). NMR (400 MHz, CDCl₃) d 8.17 (d, J = 8.8 Hz, 1H), 7.68 (d, J = 8.8 Hz, 1H), 4.09 (s, 3H).

References:

CINCERA THERAPEUTICS PTY LTD WO2021/12018, 2021, A1 Location in patent:Page/Page column 63; 85; 90-91

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63001-30-9 Synthesis