Polypeptide-drug conjugate with tumor directed therapy effect, and its application
A technology of therapeutic effect and conjugate, applied in the field of biomedicine, can solve the problems of reducing normal tissue damage and high drug loading
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Embodiment 1
[0089] The synthesis of embodiment 1 compound 2
[0090] 2-Aminoethanol (1.2g, 20mmol) and 5N NaOH solution (4.8mL) were dissolved in dioxane / H 2 In a mixed solvent of O (15mL / 7mL), Boc 2 O (5.0g, 23mmol) was dissolved in dioxane, the diluted Boc 2 O was slowly added dropwise to the reaction system, stirred overnight at room temperature, concentrated, extracted with 10% citric acid solution and ethyl acetate, and the organic phase was washed with anhydrous Na 2 SO 4 After drying, the solvent was spin-dried to obtain pure compound 2 (2.7 g, 85%).
Embodiment 2
[0091] The synthesis of embodiment 2 compound 3
[0092] The obtained compound 2 (1.6g, 10mmol), N-hydroxysuccinimide (1.79g, 11mmol) and triphenylphosphine (2.88g, 11mmol) were dissolved in 25mL DCM, and at 0°C, DEAD (1.92g, 11mmol) was added to the reaction system, stirred overnight at room temperature, the solvent was spin-dried and passed through the column to obtain pure product 3 (2.91g, 95%).
Embodiment 3
[0093] The synthesis of embodiment 3 compound 4
[0094] The obtained compound 3 (1.78g, 5.8mmol) was dissolved in 10mL of ethanol, and then hydrazine hydrate (187L, 5.97mmoL) was slowly added dropwise to the reaction system, a white precipitate appeared in the system, and the reaction was monitored by TLC until the substrate After consumption, it was filtered, the filtrate was concentrated, and passed through a column to obtain pure compound 4 (800mg, 78%).
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