反应详情

To a mixture of EXAMPLE 531B (192 mg) and 2-chlorophenylboronic acid (76 mg) in tetrahydrofuran (6 ml) was added tris(dibenzylideneacetone)dipalladium(0) (19 mg), tri-t-butyl-phosphonium tetrafluoroborate (12 mg) and cesium fluoride (200 mg). The mixture was purged with argon and stirred at room temperature for 24 hours. The mixture was diluted with ethyl acetate (200 mL) and washed with water, and brine and dried over Na2SO4. Concentration of the mixture and column purification of the crude material (5% ethyl acetate in hexane) provided the title compound. A portion of this material (50 mg) was dissolved in 1:1 tetrahydrofuran/methanol with a few drops of water and hydrolyzed with LiOH. Subsequent purification via RP HPLC afforded the title compound. 1H NMR (300 MHz, DMSO-d6) δ 10.80 (m, 1H), 8.27 (m, 1H), 7.90 (m, 1H), 7.55 (m, 1H), 7.53 (m, 1H), 7.42 (m, 3H), 7.34 (m, 3H), 7.21 (m, 2H), 7.03 (m, 1H), 6.98 (m, 2H), 3.21 (m, 4H), 3.08 (t, 2H), 1.79 (m, 2H), 0.96 (t, 3H).

1. customThe mixture was purged with argon
2. additionThe mixture was diluted with ethyl acetate (200 mL)
3. washwashed with water, and brine
4. dry with materialdried over Na2SO4
5. customConcentration of the mixture and column purification of the crude material (5% ethyl acetate in hexane)