反应详情

A 2.0 g (4.9 mmol) sample of the methyl ester product compound from Example 1 was dissolved in 80 ml of ethanol and treated with 80 ml of 10% NaOH at ambient temperature for 3 days. The ethanol was removed in vacuo and the aqueous phase acidified to pH 1 with hydrochloric acid which caused the product to precipitate; filtration and drying in vacuo gave 1.65 g (86%) of colorless compound: mp 134–135° C.; NMR (DMSO-d6) δ 0.85 (t, J=7 Hz, 3H), 0.90 (t, J=7 Hz, 3H), 1.23–1.39 (m, 4H), 1.53–1.68 (m, 4H), 2.59 (t, J=7 Hz, 2H), 2.78 (t, J=7 Hz, 2H), 5.37 (s, 2H), 5.37 (s, 2H), 7.18–7.26 (m, 2H), 7.28–7.37 (m, 3H), 7.42–7.48 (m, 1H), 7.53–7.60 (m, 1H), 7.70–7.75 (m, 1H).

1. customThe ethanol was removed in vacuo
2. customto precipitate
3. filtrationfiltration
4. customdrying in vacuo