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Volumn , Issue 17, 2008, Pages 2647-2650

Investigation of a tandem iminium ion allylation approach to piperidines

Author keywords

Allylsilane; Annulation; Iminium ion; Lewis acid; Piperidines

Indexed keywords

ALKENE; IMINIUM ION; ION; PIPERIDINE DERIVATIVE; UNCLASSIFIED DRUG;

EID: 55449113527     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-0028-1083525     Document Type: Article
Times cited : (10)

References (35)
  • 1
    • 0002437687 scopus 로고
    • Brossi, A, Ed, Academic Press: San Diego
    • (a) Strunzand, G. M.; Finlay, J. A. The Alkaloids, Vol. 26; Brossi, A., Ed.; Academic Press: San Diego, 1986, 89.
    • (1986) The Alkaloids , vol.26 , pp. 89
    • Strunzand, G.M.1    Finlay, J.A.2
  • 24
    • 33845953429 scopus 로고    scopus 로고
    • For a similar strategy to pyrans, see
    • For a similar strategy to pyrans, see: Epstein, O. L.; Rovis, T. J. Am. Chem. Soc. 2006, 128, 16480.
    • (2006) J. Am. Chem. Soc , vol.128 , pp. 16480
    • Epstein, O.L.1    Rovis, T.2
  • 27
    • 33645494788 scopus 로고    scopus 로고
    • A related approach that employs the addition of α-methylstyrene to an ammonium chloride/formaldehyde mixture has been used to prepare the piperidine core of haloperidol: Janssen, P. A. J, van de Westeringh, C, Jageneau, A. H. M, Demoen, P. J. A, Hermans, B. K. F, van Daele, G. H. P, Schellekens, K. H. L, van der Eycken, C. A. M, Niemegeers, C. J. E. J. Med. Pharm. Chem. 1959, 1, 281
    • A related approach that employs the addition of α-methylstyrene to an ammonium chloride/formaldehyde mixture has been used to prepare the piperidine core of haloperidol: Janssen, P. A. J.; van de Westeringh, C.; Jageneau, A. H. M.; Demoen, P. J. A.; Hermans, B. K. F.; van Daele, G. H. P.; Schellekens, K. H. L.; van der Eycken, C. A. M.; Niemegeers, C. J. E. J. Med. Pharm. Chem. 1959, 1, 281.
  • 32
    • 55449095978 scopus 로고    scopus 로고
    • The low yields of product appear to be due to competing addition of BSA to 5. Indeed, addition of BSA (1 equiv) to a mixture of 5 and TMSOTf (1 equiv) in the absence of allylsilane 1 resulted in <20% recovery of 5 together with unidentified material.
    • The low yields of product appear to be due to competing addition of BSA to 5. Indeed, addition of BSA (1 equiv) to a mixture of 5 and TMSOTf (1 equiv) in the absence of allylsilane 1 resulted in <20% recovery of 5 together with unidentified material.
  • 33
    • 0041540779 scopus 로고    scopus 로고
    • For an excellent discussion and lead references, see
    • For an excellent discussion and lead references, see: Organ, M. G.; Winkle, D. D.; Huffmann, J. J. Org. Chem. 1997, 62, 5254.
    • (1997) J. Org. Chem , vol.62 , pp. 5254
    • Organ, M.G.1    Winkle, D.D.2    Huffmann, J.3
  • 34
    • 55449112596 scopus 로고    scopus 로고
    • Representative Experimental Procedure for the Preparation of [3+3]-Cycloaddition Adducts; Synthesis of 7-Methylenehexahydroindolizin-3(5H)-one (7, To a solution of 5 (60 mg, 0.35 mmol, 1 equiv) in CH2Cl2 (1.5 mL) at -78 °C was added 1 (69 mg, 0.35 mmol, 1 equiv) in CH2Cl2 (1.5 mL) followed by TMSOTf (0.03 mL, 0.17 mmol, 0.5 equiv, The reaction was left at -78 °C for 1 h before being warmed to r.t. After 16 h, the reaction was quenched with aq NaHCO3 solution and extracted with CH2Cl2. The organic layers were washed with brine before drying over MgSO4. The reaction was concentrated in vacuo. Purification by silica gel chromatography provided 7 as a mixture of isomers (44 mg, 84, exo/endo, 1:4, FTIR: 3055 (m, 2986 (m, 2685 (w, 1686 (s, 1668 (s, 1422 (m, 1266 (s) cm-1. 1H NMR 250 MHz, CDCl3, δ, 1.50
    • 13NO: 151.0997; found: 151.0999.
  • 35
    • 0013570749 scopus 로고    scopus 로고
    • For comparative spectroscopic data of exo-7, see: Gelas-Mialhe, Y.; Gramain, J. C.; Hajouji, H.; Remuson, R. Heterocycles 1992, 34, 37.
    • (b) For comparative spectroscopic data of exo-7, see: Gelas-Mialhe, Y.; Gramain, J. C.; Hajouji, H.; Remuson, R. Heterocycles 1992, 34, 37.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.