Synthesis 2017; 49(03): 637-646
DOI: 10.1055/s-0036-1588605
paper
© Georg Thieme Verlag Stuttgart · New York

Brønsted Acid Catalyzed Selective Cyclization Reaction: An Efficient and Facile Synthesis of Polysubstituted Imidazole and Pyrrole Derivatives

Lei Dai
Cw Chu college, College of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou 221116, Jiangsu, P. R. of China   Email: lcrong@jsnu.edu.cn
,
Ping Shu
Cw Chu college, College of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou 221116, Jiangsu, P. R. of China   Email: lcrong@jsnu.edu.cn
,
Zhansheng Wang
Cw Chu college, College of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou 221116, Jiangsu, P. R. of China   Email: lcrong@jsnu.edu.cn
,
Qingyang Li
Cw Chu college, College of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou 221116, Jiangsu, P. R. of China   Email: lcrong@jsnu.edu.cn
,
Qiuyu Yu
Cw Chu college, College of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou 221116, Jiangsu, P. R. of China   Email: lcrong@jsnu.edu.cn
,
Yanhui Shi
Cw Chu college, College of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou 221116, Jiangsu, P. R. of China   Email: lcrong@jsnu.edu.cn
,
Liangce Rong*
Cw Chu college, College of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou 221116, Jiangsu, P. R. of China   Email: lcrong@jsnu.edu.cn
› Author Affiliations
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Publication History

Received: 31 August 2016

Accepted after revision: 02 September 2016

Publication Date:
06 October 2016 (online)


Abstract

An efficient and facile synthesis of 3-(5-aryl-1,3-dimethyl-2-oxo-2,3-dihydro-1H-imidazol-4-yl)indolin-2-one and 3-(2,5-diaryl-3-oxo-1,2,3,6-tetrahydropyrrolo[2,3-c]pyrazol-4-yl)indolin-2-one derivatives is reported from the selective cyclization reaction of 3-(2-aryl-2-oxoethylidene)indolin-2-one and 1,3-dimethylurea or 5-amino-2-phenyl-2,4-dihydro-3H-pyrazol-3-one under Brønsted acid conditions. Although there are two carbonyl groups in the substrate, the carbonyl group out of isatin is specially chosen for the cyclization reaction to give the target products. The reported products are new five-membered heterocyclic compounds and the results also show that p-toluenesulfonic acid monohydrate (PTSA·H2O) is an effective catalyst for this synthesis. Therefore, the advantages of this approach are excellent yields, short reaction times, operational simplicity, and good regioselectivity.

Supporting Information