反应详情

温度

40 °C

Crude Eltrombopag (151 g, HPLC purity: 98.5%) was suspended in 2.9 L of glacial acetic acid in 3 L reactor. The suspension was stirred for five hours under reflux and cooled to 40° C. Crystals formed and were filtrated off, washed with 200 mL of methanol:water (1:1) and dried at 60° C./0 mbar overnight yielding 133 g orange solid of pure 3′-{N′-[1-(3,4-Dimethylphenyl)-3-methyl-5-oxo-1,5-dihydro-pyrazol-4-ylidene]hydrazino}-2′-hydroxybiphenyl-3-carboxylic acid (HPLC: 99.8%; XRPD: form I) (Yield=88%). PXRD analysis provided the diffractogram as shown in FIG. 1. DSC analysis provided the thermogram as shown in FIG. 2

1. temperatureunder reflux
2. customCrystals formed
3. filtrationwere filtrated off
4. washwashed with 200 mL of methanol:water (1:1)
5. customdried at 60° C./0 mbar overnight