反应详情

The product of Example 309G (35 mg, 0.14 mmol) and the product of Example 309B (50 mg, 0.14 mmol) were reacted in toluene (3 mL) at 100° C. for 3 hours. The resulting precipitate was collected by filtration and washed with toluene and diethyl ether to give the title compound (52 mg, 73.3%). The sodium salt of the title compound was prepared according to the procedure of Example 1D. 1H NMR (300 MHz, DMSO-d6) δ ppm 3.26 (s, 3 H), 4.65 (s, 2 H), 4.72 (s, 2 H), 5.62 (s, 2 H), 7.28 (m, 7 H), 7.43 (s, 2 H), 7.51 (d, J=8.09 Hz, 1 H), 7.75 (m, 1 H), 8.22 (d, J=8.09 Hz, 1 H).

1. filtrationThe resulting precipitate was collected by filtration
2. washwashed with toluene and diethyl ether