反应详情

A mixture of the title A compound, 5-(2,6-dimethyl-4-nitrophenoxy)-2-(2-methoxy-ethoxymethoxy)benzoic acid 2-methoxyethoxymethyl ester (3.2 g, 6.68 mmol) and palladium on activated carbon (10 wt. %; 320 mg) in 50 mL of EtOAc is stirred under hydrogen atmosphere (H2, 1 atm) for 3 h. The catalyst is removed by vacuum filtration through celite, washed with EtOAc, and the combined filtrate and washings are concentrated and dried under vacuum to give 5-(4-amino-2,6-dimethylphenoxy)-2-(2-methoxyethoxymethoxy)benzoic acid 2-methoxy-ethoxymethyl ester: NMR (CDCl3) 2.07 (s, 6H), 3.37 (s, 3H), 3.40 (s, 3H), 3.52-3.62 (m, 4H), 3.83-3.92 (m, 4H), 5.26 (s, 2H), 5.52 (s, 2H), 6.60 (s, 2H), 6.80 (dd, 1H, J=8.3, 3), 7.13 (d, 1H, J=8.3)7.24 (d, 1H, J=3).

1. customThe catalyst is removed by vacuum filtration through celite
2. washwashed with EtOAc
3. concentrationthe combined filtrate and washings are concentrated
4. customdried under vacuum