Alkaline protease-catalyzed synthesis of quinazolinone derivatives was developed between β-keotester and o-aminobenzamide. Because ethanol is one kind of eco-friendly solvents, this method can reduce the impact of solvents on the environment. Alkaline protease as a biocatalyst has many advantages, e.g. high catalytic activity, environmentally friendly, wide variety of sources and simple operation. In addition, a variety of quinazolinone derivatives was obtained with good to excellent yields just using 2000 U alkaline protease as catalyst.
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