Method for modifying protein tryptophan residues
A protein and tryptophan technology, applied in the field of biochemistry, can solve problems such as difficult modification of aromatic amino acids, and achieve remarkable technological progress
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[0031] 1. Synthesis of Thiol Substrates
[0032] 12.2 g of 4-hydroxybenzaldehyde and 11.8 g of propyne bromide were added to a round bottom flask and dissolved with 300 mL of ethanol. 13.8 g of anhydrous potassium carbonate was added to the reaction system, and heated under reflux in an oil bath for 6 hours. After the reaction, the organic solvent was removed by rotary evaporation, and 500 mL of water was added to dilute the obtained viscous mixture. The aqueous solution was extracted with 100 mL×3 ethyl acetate, the organic phases were combined, washed with 100 mL×2 0.1M dilute hydrochloric acid and 100 mL×2 saturated brine, dried over anhydrous sodium sulfate, and the organic solvent was removed by rotary evaporation. The crude product was recrystallized from petroleum ether and ethyl acetate, and the resulting white solid was filtered and dried, which was the product 4-propargyloxybenzaldehyde (13.9 g, yield 87%).
[0033] 1 H NMR (300MHz, Chloroform-d) δ9.84(s, 1H), 7.9...
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