Aluminium lithium hydride → 2-(Benzyloxy)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine

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Reaction Steps

A 1 M solution of lithium aluminum hydride in THF (0.77 mL, 0.77 mmol) was added dropwise to a stirred solution of 2-(benzyloxy)-6,7-dihydropyrazolo[1,5-a]pyrazin-4(5H)-one (0.16 g, 0.65 mmol) in THF (4 mL) under nitrogen at 0° C. The mixture was stirred at room temperature for 4 hours and diluted with AcOEt. Na2SO4.10H2O was added at 0° C. and the mixture was stirred for 20 minutes at this temperature, filtered through a pad of diatomaceous earth and then washed with additional AcOEt. The filtrate was evaporated in vacuo to yield 2-(benzyloxy)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine (0.14 g, 97% yield) as a yellow oil, that was used in the next step without further purification.

Provenance & Evidence