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5-Aminoimidazole-4-carboxamide reacts with aromatic aldehydes to afford Schiff bases which can be cyclised to imidazo[1,5- a]quinazoline-3-carboxamides in DMF/sodium hydride. The potassium salt of imidazo[1,5- a]quinazoline-3-carboxylic acid undergoes deuterium exchange in D 2 O at the 1-position.
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Hannah et al. (2003) studied this question.
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