2-Methyl-2H-pyrazol-3-ylamine → 1-[(5-amino-1-methyl-1H-pyrazol-4-yl)methyl]-4-propylpyrrolidin-2-one

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Reaction Conditions

Reaction Steps

In a 25 ml, three-necked flask fitted with a magnetic stirrer, under inert atmosphere, 1-(chloromethyl)-4-propylpyrrolidin-2-one x63 (0.136 g, 0.77 mmol) is added dropwise to a suspension of AlCl3 (0.033 g, 0.25 mmol) in TCE at 0° C. In another 25 ml, three-necked flask fitted with a magnetic stirrer and reflux condenser under inert atmosphere, 1-methyl-1H-pyrazol-5-amine x64 (0.05 g, 0.51 mmol) is dissolved in TCE (10 ml) and the mixture is heated at 65° C. At this temperature, the solution containing compound x63 and AlCl3 is added dropwise and the mixture is heated at 80° C. for 16 h. Water and CH2Cl2 are added, the pH is brought up to 8 with sodium bicarbonate and the aqueous phase is extracted with CH2Cl2. The combined organic phases are washed with brine, dried over MgSO4, filtered and concentrated. The crude product is purified by preparative chromatography on silicagel, then by preparative chromatography on reverse phase to afford 19 mg of 1-[(5-amino-1-methyl-1H-pyrazol-4-yl)methyl]-4-propylpyrrolidin-2-one 170.

Provenance & Evidence