5-Azido-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidine-3-carbaldehyde → 5-Amino-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidine-3-carbaldehyde

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Reaction Steps

The above product 5-azido-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidine-3-carbaldehyde (1.09 g, 4.46 mmol) was subjected to hydrogenation using 10% wt palladium on carbon in ethanol. The reaction was stirred under hydrogen for 6 hours. The mixture was filtered through celite and sonicated with 1:1 mixture of ethyl acetate and hexane. The light yellow solid was filtered and dried to yield 5-amino-7-(cyclopropylamino)pyrazolo[1,5-a]pyrimidine-3-carbaldehyde as product 750 mg (85% yield). LCMS (M+1=218)

Provenance & Evidence