反应详情

温度

65 °C

To a solution of the compound of Example 32 (100 mg, 285 μmol) in acetonitrile (2 mL), K2CO3 (56 mg, 427 μmol) followed by dimethyl chloromalonate (57 mg, 341 μmol) is added. The mixture is stirred at 65° C. for 18 h. The mixture is diluted with EA and washed with water. The org. extract is concentrated and the crude product is purified on prep. TLC plates using heptane:EA 4:1 to give 2-{2-ethyl-4-[5-(5-isobutyl-4-methyl-pyridin-2-yl)-[1,2,4]oxadiazol-3-yl]-6-methyl-phenoxy}-malonic acid dimethyl ester (95 mg) as a colourless oil; LC-MS: tR=1.17 min, [M+H]+=482.01. This material (95 mg, 197 μmol) is dissolved in ethanol (10 mL) and treated with NaBH4 (60 mg, 1.58 mmol). The mixture is stirred at 60° C. for 1 h before the reaction is quenched with water. The mixture is extracted twice with EA and the combined extracts are concentrated. The crude product is purified on prep. TLC plates using heptane:EA 1:1 to give the title compound (44 mg) as a colourless oil; LC-MS: tR=1.02 min, [M+H]+=426.01; 1H NMR (CDCl3): δ1.00 (d, J=6.5 Hz, 6H), 1.31 (t, J=7.3 Hz, 3H), 1.95 (hept, J=6.3 Hz, 1H), 2.08 (t br, J=5.5 Hz, 2H), 2.42 (s, 3H), 2.47 (s, 3H), 2.63 (d, J=7.0 Hz, 2H), 2.80 (q, J=7.5 Hz, 2H), 3.91-4.05 (m, 4H), 4.19 (quint, J=4.5 Hz, 1H), 7.95 (s, 1H), 7.98 (s, 1H), 8.10 (s, 1H), 8.55 (s, 1H).

1. additionis added
2. washwashed with water
3. extractionextract
4. concentrationis concentrated
5. customthe crude product is purified on prep