CP-885,316 ( 1 ), an imidazo[4,5- c ]pyridine, 4, was prepared from 3,4-diaminopyridine ( 9 ). Two routes were demonstrated using the regioselective introduction of either an acetamide at the 3-position or a tert -butylcarbamate at the 4-position.
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Caron et al. (2006) studied this question.
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