Aluminium lithium hydride → Rac-6-methyl-2-phenoxymethyl-4,5,6,7-tetrahydro-pyrazolo[1,5-a]pyrazine

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Reaction Steps

A 1M solution of lithium aluminum hydride in THF (2.14 mL, 2.14 mmol) was added dropwise to a stirred solution of rac-6-methyl-2-phenoxymethyl-6,7-dihydro-5H-pyrazolo[1,5-a]pyrazin-4-one (0.5 g, 1.94 mmol) in THF (12 mL) under N2 at 0° C. The reaction mixture was stirred at room temperature for 2.5 days and diluted with AcOEt. Na2SO4.10H2O was added at 0° C. and the mixture stirred for 15 minutes at 0° C., filtered through a pad of diatomaceous earth and then washed with additional AcOEt. The solvents were evaporated in vacuo to yield rac-6-methyl-2-phenoxymethyl-4,5,6,7-tetrahydro-pyrazolo[1,5-a]pyrazine (0.45 g, 84% yield) as an oil that crystallized upon standing, and that was used in the next step without further purification.

Provenance & Evidence