Synlett 2014; 25(12): 1781-1785
DOI: 10.1055/s-0034-1378265
letter
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Multisubstituted Tetrahydroquinolines through Aza-Michael/ Michael Addition Catalyzed by Quaternary Ammonium Salt

Li Zhang
a   Department of Chemistry, Shanghai University, Shanghai 200444, P. R. of China   eMail: lpsong@shu.edu.cn
b   Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. of China   Fax: +86(21)54925192   eMail: ymwu@mail.sioc.ac.cn
,
Yajun Li
c   School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, P. R. of China
b   Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. of China   Fax: +86(21)54925192   eMail: ymwu@mail.sioc.ac.cn
,
Yafen Yuan
b   Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. of China   Fax: +86(21)54925192   eMail: ymwu@mail.sioc.ac.cn
,
Bin Zhang
b   Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. of China   Fax: +86(21)54925192   eMail: ymwu@mail.sioc.ac.cn
,
Yuan Gao
b   Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. of China   Fax: +86(21)54925192   eMail: ymwu@mail.sioc.ac.cn
,
Yongming Wu*
b   Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. of China   Fax: +86(21)54925192   eMail: ymwu@mail.sioc.ac.cn
,
Liping Song*
a   Department of Chemistry, Shanghai University, Shanghai 200444, P. R. of China   eMail: lpsong@shu.edu.cn
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Publikationsverlauf

Received: 27. Februar 2014

Accepted after revision: 07. Mai 2014

Publikationsdatum:
05. Juni 2014 (online)


Abstract

Multisubstituted tetrahydroquinolines were obtained in excellent yield from an array of N-[2-(3-oxo-3-phenylprop-1-enyl)phenyl]benzamide derivatives in a reaction catalyzed by quaternary ammonium salt. This method provides an efficient approach to the synthesis of densely substituted tetrahydroquinoline derivatives.

Supporting Information

 
  • References and Notes

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  • 17 Synthesis of 6a; Typical Procedure: A mixture of 5a (32.7 mg, 0.01 mmol), K3PO4 (84.9 mg, 0.04 mmol), and BnEt3NCl (2.28 mg, 0.001 mmol) in toluene (4 mL) was stirred at room temperature for 6 h. Upon completion of reaction as indicated by TLC, the solvent was evaporated and the residue was purified by flash chromatography on silica gel to provide the desired product 6a. 1H NMR (400 MHz, CDCl3): δ = 10.47 (s, 1 H), 7.98 (dd, J = 11.9, 4.7 Hz, 4 H), 7.89 (d, J = 8.1 Hz, 1 H), 7.59 (t, J = 7.4 Hz, 1 H), 7.52–7.43 (m, 6 H), 67.43–7.37 (m, 1 H), 7.37–7.27 (m, 4 H), 7.27–7.12 (m, 6 H), 7.09 (d, J = 7.6 Hz, 1 H), 7.00 (dd, J = 11.1, 4.1 Hz, 1 H), 6.93 (t, J = 7.4 Hz, 1 H), 6.68 (d, J = 7.0 Hz, 1 H), 6.39 (d, J = 7.8 Hz, 1 H), 6.15 (d, J = 6.9 Hz, 1 H), 4.41 (dd, J = 11.4, 6.9 Hz, 1 H), 4.26 (t, J = 9.0 Hz, 1 H), 3.63 (dd, J = 18.1, 8.7 Hz, 1 H), 3.43 (dd, J = 18.1, 2.7 Hz, 1 H); 13C NMR (100 MHz, CDCl3): δ = 200.05, 197.45, 170.36, 165.29, 138.67, 136.52, 136.32, 136.27, 135.52, 134.70, 134.43, 133.88, 133.49, 132.59, 131.40, 130.83, 129.17, 128.77, 128.68, 128.50, 128.44, 128.06, 128.01, 127.44, 127.38, 126.96, 126.81, 126.49, 125.66, 125.21, 125.06, 58.14, 55.14, 37.67, 34.79; IR (KBr): 3269, 3059, 2904, 1673, 1597, 1449, 1361, 1226, 972, 755 cm–1; MS (ESI): m/z = 655 [M + H+]; HRMS (ESI): m/z [M + H+] calcd. for C44H35N2O4 +: 655.2586; found: 655.25913.