Hydrochloric Acid → Amino(1,4,5,6-tetrahydropyrimidine-5-yl)acetamide dihydrochloride

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Reaction Steps

Amino(pyrimidin-5-yl)acetamide (950 mg, 6.7 mmol) is suspended in a mixture of 50 ml water and concentrated hydrochloric acid (13.3 mmol). The mixture is hydrogenated at 26 psig over 300 mg Pd-on-carbon 10% in a Parr hydrogenator for 3h. Then the suspension is filtered and the filter rinsed twice with hot water (20 ml). The filtrate can be evaporated in vacuo to give 1.41 g yellow oil (92%). The oil is crystallized from anhydrous methanol/THF to give 1.33 g (87%) white crystals, identified by 300 MHz nmr.

Provenance & Evidence