The highly efficient transformation of CX2 (O, S) into valuable chemicals at atmospheric pressure is an attractive topic. A novel method of preparing quinazoline derivatives by capturing CX2 (O, S) in reusable, room-temperature, reversible ionic liquids (ReILs) with high yields (up to 98%) at 40 °C and atmospheric pressure was developed in this paper. The different reaction conditions were optimized and the products were easily separated from the ReILs which could be reused at least six times without considerable loss in yield. The plausible mechanism of capturing CX2 (O, S) in the ReILs was proposed and it provides a green, efficient protocol to capture CX2 (O, S) in ReILs to synthesize quinazoline derivatives.

A novel and efficient method for the chemoenzymatic selective formation of C–N bonds in the synthesis of a 2-substituted benzimidazole heterocycle, catalyzed by lipase from porcine pancreas (PPL), has been developed. A series of 2-substituted benzimidazole derivatives were synthesized under mild conditions, with high yields (89–96%) and high selectivity. The blank and control experiments reveal that PPL plays an important catalytic role during the selective C–N bond formation process. The results demonstrate that PPL has a broad catalytic tolerance towards different aldehydes containing electron-donating or -withdrawing groups in this reaction. This study provides an efficient tool for the selective formation of C–N bonds in the synthesis of 2-substituted benzimidazole derivatives.

A simple and efficient protocol of synthesizing 2,4,5-trisubstituted imidazoles has been developed using lipase as a novel catalyst under mild conditions. A series of imidazole derivatives were synthesized with good yields. The probable enzymatic mechanism was proposed. This method expands the catalytic scope of lipase and provides a novel method to prepare imidazole derivatives.

A facile enzymatic one-pot multicomponent synthesis of 4-thiazolidinones was developed. The trypsin from porcine pancreas displayed great catalytic activity to promote the reaction of aldehyde, amine and mercaptoacetic acid with high yields showing a broad substrate specificity in this reaction. This trypsin-catalyzed multicomponent conversion method provided a novel strategy to synthesize thiazolidinones and expanded the application of trypsin in organic synthesis.

A novel method for the synthesis of substituted pyrroles catalyzed by \(\alpha \)-amylase from hog pancreas via Paal–Knorr reaction was developed. A series of pyrrole derivatives were synthesized under mild conditions and the products were obtained with good to excellent yields (60–99 %). The impact of factors, such as solvents, enzyme amount, and temperature, on the reaction were investigated. This study reports an efficient route for the synthesis of N-substituted pyrrole derivatives.