Preparation method of dextran-based ROS-responsive camptothecin polymer prodrug
A technology of dextran and camptothecin, which is applied in the direction of pharmaceutical formulations, medical preparations with non-active ingredients, medical preparations containing active ingredients, etc., can solve the problems of strong toxic side effects, poor water solubility, non-selectivity, etc. Achieve high drug loading rate, effective treatment, and good stability
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[0030] Example 1 Preparation of dextran-based ROS-responsive camptothecin polymer prodrug DCPT
[0031] like figure 1 The synthetic schematic shown is for the preparation of the dextran-based ROS-responsive camptothecin polymer prodrug DCPT, including the following steps:
[0032](1) Preparation of Dex-Br: Under argon atmosphere, 1 g of dextran (Dex) dissolved in 10 mL of ionic liquid 1-allyl-3-methylimidazole chloride was cooled to 0 °C, and then Add 7 mL of N-methylpyrrolidone (NMP) and 7 mL of N,N-dimethylformamide (DMF), followed by slowly adding 10 mL of 2-bromoisobutyryl bromide (BIBB), ice bath for 0.5- 2h, then warmed to room temperature (25°C) and reacted in the dark for 12-72h, then precipitated in deionized water, dissolved the obtained precipitate with acetone, and repeated the purification three times to obtain a light yellow intermediate product, which was dried in a vacuum drying oven (25-30°C). ), then the obtained pale yellow intermediate product was dissolv...
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