Ethyl orthoformate → 3-(3-ethoxy-4-((6-methoxypyridin-3-yl)methoxy)benzyl)-6-iodo-3H-imidazo[4,5-b]pyridine

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Reaction Steps

To a stirred suspension of N2-(3-ethoxy-4-((6-methoxypyridin-3-yl)methoxy)benzyl)-5-iodopyridine-2,3-diamine (3.99 g, 7.88 mmol) in ethanol (50 mL) was added triethyl orthoformate (2.67 g, 18.02 mmol) and p-toluenesulfonic acid monohydrate (0.075 g, 0.39 mmol). As the mixture was heated to reflux, a brown solution was obtained. After 30 min, the mixture was allowed to cool to room temperature, resulting in the formation of a precipitate. The solids were isolated by filtration, washed with ethanol, and dried to provide 2.50 g (61%) of 3-(3-ethoxy-4-((6-methoxypyridin-3-yl)methoxy)benzyl)-6-iodo-3H-imidazo[4,5-b]pyridine as a tan solid.

Provenance & Evidence