Ammonia → 4-Hydroxy-3,5-dimethoxy-benzoic acid N-tert-butyl-N'-(5-methyl-2,3-dihydro-benzo[1,4]dioxine-6-carbonyl)-hydrazide

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Acetic acid 4-[N-tert-butyl-N′-(5-methyl-2,3-dihydro-benzo[1,4]dioxine-6-carbonyl)-hydrazinocarbonyl]-2,6-dimethoxy-phenyl ester (300 mg) was dissolved in methanol with 28% aqueous ammonia (750 mg). The mixture was stirred at ambient temperature over the weekend. The precipitate was filtered to provide 110 mg of white solid 4-hydroxy-3,5-dimethoxy-benzoic acid N-tert-butyl-N′-(5-methyl-2,3-dihydro-benzo[1,4]dioxine-6-carbonyl)-hydrazide. 1H NMR (CDCl3, 300 MHz) δ (ppm): 1.59 (s, 15H), 2.02 (s, 3H), 3.85 (s, 6H), 4.21 (m, 4H), 5.6-5.7 (broad s, 1H), 6.22 (d, 1H), 6.58 (d, 1H), 6.81 (s, 2H).

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