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ChemicalBook CAS DataBase List 6-Chloro-iMidazo[1,2-b]pyridazine-3-carboxylic acid ethyl ester
1150566-27-0

6-Chloro-iMidazo[1,2-b]pyridazine-3-carboxylic acid ethyl ester synthesis

7synthesis methods
-

Yield:1150566-27-0 77%

Reaction Conditions:

with N-ethyl-N,N-diisopropylamine in acetonitrile at 20; for 4 h;

Steps:

2

Intermediate 2 6-Chloro-imidazo[1,2-b]pyridazine-3-carboxylic acid ethyl ester; S-Chloro-β^dimethylamino-methyleneaminoJ-i-ethoxycarbonylmethyl-pyridazin- 1-ium bromide (11.40 g, 32.40 mmol) was dissolved in acetonitrile (200 mL) and diisopropylethylamine (15.22 mL, 64.81 mmol) was added. The reaction mixture was stirred for 4 hours at room temperature. The solvent was removed in vacuo and the residue was triturated from water to give 5.77 g of 6-chloro-imidazo[1 ,2- b]pyridazine-3-carboxylic acid ethyl ester as a pale brown solid (77% yield). 1H NMR (300 MHz, CDCI3): δ 8.36 (1 H, s), 8.01 (1H, d, J = 9.4 Hz), 7.27 (1H, d, J = 9.4 Hz), 4.46 (2H, q, J = 7.1 Hz)1 1.37 (3H, W = 7.1 Hz). LCMS: 226 [M+1J. (MW: 225.64)

References:

WO2009/60197,2009,A1 Location in patent:Page/Page column 59

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