反应详情

A solution of the product of Example 354 (15 mg, 0.033 mmol) and maleic anhydride (100 mg, 1.0 mmol) in pyridine (2 mL) was heated at 160° C. in a microwave reactor for 1 hour. The crude mixture was cooled to 25° C. and purified by preparative HPLC on a Waters Symmetry C8 column (25 mm×100 mm, 7 μm particle size) using a gradient of 10% to 100% acetonitrile:0.1% aqueous trifluoroacetic to yield the title compound (5.3 mg, 30%). The disodium salt was made by the procedure of Example 1D using 2 equivalents of sodium hydroxide. MS (ESI−) m/z 524 (M−H)−. 1H NMR (300 MHz, DMSO-d6) δ 1.03 (d, J=6.25 Hz, 6 H) 1.86 (m, 1 H) 2.27 (m, 4 H) 2.66 (m, 2 H) 5.94 (t, J=7.54 Hz, 1 H) 6.81 (m, 2 H) 7.05 (t, J=7.91 Hz, 1 H) 7.53 (m, 2 H) 8.06 (d, J=6.62 Hz, 1 H) 15.74 (s, 1 H).

1. custompurified by preparative HPLC on a Waters Symmetry C8 column (25 mm×100 mm, 7 μm particle size)