Ethyl 5-methoxy-4-((1-methylpiperidin-4-yl)methoxy)-2-nitrobenzoate → Ethyl 2-amino-5-methoxy-4-((1-methylpiperidin-4-yl)methoxy)benzoate

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Reaction Steps

A suspension of ethyl 3-methoxy-4-(1-methylpiperidin-4-ylmethoxy)-6-nitrobenzoate (3.89 g, 10 mmol) in methanol (80 ml) containing 10% platinum on activated carbon (50% wet) (389 mg) was hydrogenated at 1.8 atmospheres pressure until uptake of hydrogen ceased. The reaction was filtered through celite, the filtrate was evaporated and the residue was taken up in water (30 ml) and adjusted to pH 10 with a saturated solution of sodium hydrogen carbonate. The mixture was diluted with ethyl acetate/diethyl ether (1:1) and the organic layer was separated. The aqueous layer was further extracted with ethyl acetate/ether and the organic layers were combined prior to washing with water and brine. Solvent evaporation in vacuo, followed by trituration with a mixture of diethyl ether/isohexane yielded ethyl 6-amino-3-methoxy-4-(1-methylpiperidin-4-ylmethoxy)benzoate (2.58 g, 80% yield) as a white solid after drying in vacuo:

Provenance & Evidence