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He Y, Agarwal PK, Kiran INC, Yu R, Cao B, Zou C, Zhou X, Xu H, Xu B, Zhu L, Lan Y, Nicolaou KC. Efficient Synthesis of Dimeric Oxazoles, Piperidines and Tetrahydroisoquinolines from N-Substituted 2-Oxazolones. Chemistry 2016; 22:7696-701. [PMID: 27113382 DOI: 10.1002/chem.201601471] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Indexed: 02/03/2023]
Abstract
A mild and practical method for the construction of heterocycles from N-substituted 2-oxazolones through cascade, BF3 ⋅Et2 O/H2 O-catalyzed reactions involving iminium ion generation and trapping by external or internal olefinic and aryl moieties is described. Mechanistic and computational studies revealed the strong protic acid HBF4 as the initiating catalyst for these cascade reactions. Providing access to novel molecular diversity, these processes may facilitate chemical biology studies, drug discovery efforts and natural products synthesis.
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Affiliation(s)
- Yun He
- College of Pharmaceutical Sciences and Innovative Drug Research Centre, Chongqing University, 55 Daxuecheng South Rd., Shapingba, Chongqing, 401331, P. R. China.
| | - Piyush K Agarwal
- College of Pharmaceutical Sciences and Innovative Drug Research Centre, Chongqing University, 55 Daxuecheng South Rd., Shapingba, Chongqing, 401331, P. R. China
| | - I N Chaithanya Kiran
- College of Pharmaceutical Sciences and Innovative Drug Research Centre, Chongqing University, 55 Daxuecheng South Rd., Shapingba, Chongqing, 401331, P. R. China
| | - Ruocheng Yu
- Department of Chemistry, BioScience Research Collaborative, Rice University, 6500 Main Street, Houston, TX, 77030, USA
| | - Bei Cao
- College of Pharmaceutical Sciences and Innovative Drug Research Centre, Chongqing University, 55 Daxuecheng South Rd., Shapingba, Chongqing, 401331, P. R. China
| | - Cheng Zou
- College of Pharmaceutical Sciences and Innovative Drug Research Centre, Chongqing University, 55 Daxuecheng South Rd., Shapingba, Chongqing, 401331, P. R. China
| | - Xinghua Zhou
- College of Pharmaceutical Sciences and Innovative Drug Research Centre, Chongqing University, 55 Daxuecheng South Rd., Shapingba, Chongqing, 401331, P. R. China
| | - Huacheng Xu
- College of Pharmaceutical Sciences and Innovative Drug Research Centre, Chongqing University, 55 Daxuecheng South Rd., Shapingba, Chongqing, 401331, P. R. China
| | - Biao Xu
- College of Pharmaceutical Sciences and Innovative Drug Research Centre, Chongqing University, 55 Daxuecheng South Rd., Shapingba, Chongqing, 401331, P. R. China
| | - Lei Zhu
- College of Chemistry and Chemical Engineering, Chongqing University, 55 Daxuecheng South Rd., Shapingba, Chongqing, 400030, P. R. China
| | - Yu Lan
- College of Chemistry and Chemical Engineering, Chongqing University, 55 Daxuecheng South Rd., Shapingba, Chongqing, 400030, P. R. China.
| | - K C Nicolaou
- Department of Chemistry, BioScience Research Collaborative, Rice University, 6500 Main Street, Houston, TX, 77030, USA.
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