Phenolic hydroxyl-containing amino acid-N-thiocarboxylic anhydride monomer and synthesis and polymerization method thereof
A technology of phenolic hydroxyl amino acid and thiocarboxylic anhydride, which is applied in the field of polymer synthesis, can solve problems such as direct synthesis of polyamino acids that have not yet been seen, and achieve good biocompatibility and biodegradability, cheap and easily available raw materials, and high initiation activity. Effect
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[0031] Example 1
[0032] Add 36.2g (0.20mol) tyrosine, 32.0g (0.80mol) sodium hydroxide, 36.0g (0.20mol) S-ethoxythiocarbonylthioglycolic acid (XAA) into the reaction flask, and use 150mL to deionize Dissolved in water, stirred and reacted at room temperature for 72 hours to synthesize 31.3 g of N-ethoxythiocarbonyl substituted tyrosine (0.12 mol, yield 58.2%). The latter is combined with PBr in ethyl acetate 3 The reaction to form a ring yields 9.63 g Tyr-NTA monomer (0.043 mol, yield 35.7%).
[0033] Add 0.223g (1.00mmol) of Tyr-NTA to the reaction flask, dissolve it with 2.0mL of tetrahydrofuran (THF), and add 0.12mL of n-butylamine in THF (0.170mol / L, 0.020mmol), Tyr-NTA and normal The molar ratio of butylamine is 50:1. After sealing, it is placed in an oil bath at 40℃ to react for 4 days. After the reaction, the mixture is poured into ether for precipitation and filtration. The resulting polymer is vacuum dried for 1 day to obtain polytyrosine The yield was 94.2%. The obta...
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[0034] Example 2
[0035] Other polymerization conditions are the same as in Example 1, except that benzylamine is used as the initiator to initiate the ring-opening polymerization of Tyr-NTA, the solvent is N-methylpyrrolidone (NMP), and the molar ratio of Tyr-NTA to benzylamine is 20: 1. React in a thermostat at 80°C for 12 hours to obtain polytyrosine with a yield of 85.8%. The number average absolute molecular weight of the obtained polymer was 3.0 kDa.
Example Embodiment
[0036] Example 3
[0037] Other polymerization conditions are the same as in Example 1, except that the amino-terminated polyethylene glycol (PEG-NH 2 ) Initiate ring-opening polymerization of Tyr-NTA, the solvent is N,N-dimethylacetamide (DMAc), Tyr-NTA and PEG-NH 2 The molar ratio is 10:1, and the reaction is conducted in a constant temperature bath at 0°C for 2 days, and the yield of the obtained polyamino acid is 99.0%. The number average absolute molecular weight of the obtained copolymer was 3.7 kDa.
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