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Volumn , Issue 11, 2009, Pages 1785-1790

Ni-catalyzed carbocyclization of 1,6-enynes mediated by dialkylzinc reagents: Me2Zn or Et2Zn makes a difference

Author keywords

Cyclizations; Enynes; Nickel; Organozinc reagents

Indexed keywords

1,6 ENYNE DERIVATIVE; ALKADIENE; ALKYNE; DIETHYLZINC ETHANOL; DIMETHYLZINC; NICKEL COMPLEX; REDUCING AGENT; UNCLASSIFIED DRUG; ZINC DERIVATIVE;

EID: 67649946015     PISSN: 09365214     EISSN: 14372096     Source Type: Journal    
DOI: 10.1055/s-0029-1217368     Document Type: Article
Times cited : (10)

References (62)
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    • A special issue on nickel catalysis: Jamison, T. F. Tetrahedron 2006, 62, 7499.
    • (d) A special issue on nickel catalysis: Jamison, T. F. Tetrahedron 2006, 62, 7499.
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    • For recent examples, see: a
    • For recent examples, see: (a) Maeda, K.; Saito, S. Tetrahedron Lett. 2007, 48, 3173.
    • (2007) Tetrahedron Lett , vol.48 , pp. 3173
    • Maeda, K.1    Saito, S.2
  • 24
    • 67649979586 scopus 로고    scopus 로고
    • Dialkylzinc reagents, zinc powder, triethylsilane, triethylboranes, and DIBAL-H have been used as the reducing agent in this type of transformation
    • Dialkylzinc reagents, zinc powder, triethylsilane, triethylboranes, and DIBAL-H have been used as the reducing agent in this type of transformation.
  • 28
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    • For a review, see
    • (d) For a review, see: Ikeda, S. Angew. Chem. Int. Ed. 2003, 42, 5120.
    • (2003) Angew. Chem. Int. Ed , vol.42 , pp. 5120
    • Ikeda, S.1
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    • 67649961049 scopus 로고    scopus 로고
    • For examples of Ni-catalyzed reductive cyclization processes with the methyl shift involving Me2Zn, see ref. 5a and references cited therein
    • 2Zn, see ref. 5a and references cited therein.
  • 36
    • 0037205927 scopus 로고    scopus 로고
    • For a example of Rh-catalyzed homodimerization of 1,6-enynes, see: (a) Evans, P. A.; Robinson, J. E.; Baum, E. W.; Fazal, A. N. J. Am. Chem. Soc. 2002, 124, 8782.
    • For a example of Rh-catalyzed homodimerization of 1,6-enynes, see: (a) Evans, P. A.; Robinson, J. E.; Baum, E. W.; Fazal, A. N. J. Am. Chem. Soc. 2002, 124, 8782.
  • 37
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    • For similar reactions of dieneynes catalyzed by Rh, see: b
    • For similar reactions of dieneynes catalyzed by Rh, see: (b) DeBoef, B.; Gilbertson, S. R. J. Am. Chem. Soc. 2002, 124, 8784.
    • (2002) J. Am. Chem. Soc , vol.124 , pp. 8784
    • DeBoef, B.1    Gilbertson, S.R.2
  • 39
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    • For examples of nickel metallocyclopentadienes in the homodimerization of 1,3-perfluoroalkylenynes, see: (d) Saito, S, Tanaka, T, Koizumi, T, Tsuboya, N, Itagaki, H, Kawasaki, T, Endo, S, Yamamoto, Y. J. Am. Chem. Soc. 2000, 122, 1810
    • For examples of nickel metallocyclopentadienes in the homodimerization of 1,3-perfluoroalkylenynes, see: (d) Saito, S.; Tanaka, T.; Koizumi, T.; Tsuboya, N.; Itagaki, H.; Kawasaki, T.; Endo, S.; Yamamoto, Y. J. Am. Chem. Soc. 2000, 122, 1810.
  • 42
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    • 3P and 5 mol% of Ni(acac)2 only led to a ratio of 1.5:1 favoring the [2+2+2] product 3a. Attempts to interject the reaction intermediate with a third alkyne (3 equiv) resulted in a complex mixture (when ethyl 3-phenylpropiolate was used) or the recovery of most of the starting 1,6-enyne 1a (when phenylacetylene or 1-hexyne were used), however, similar strategy was successful with Rh-catalyzed reactions of unactivated 1,6-enynes: (a) Baik, M.-H.; Baum, E. W.; Burland, M. C.; Evans, P. A. J. Am. Chem. Soc. 2005, 127, 1602.
    • 3P and 5 mol% of Ni(acac)2 only led to a ratio of 1.5:1 favoring the [2+2+2] product 3a. Attempts to interject the reaction intermediate with a third alkyne (3 equiv) resulted in a complex mixture (when ethyl 3-phenylpropiolate was used) or the recovery of most of the starting 1,6-enyne 1a (when phenylacetylene or 1-hexyne were used), however, similar strategy was successful with Rh-catalyzed reactions of unactivated 1,6-enynes: (a) Baik, M.-H.; Baum, E. W.; Burland, M. C.; Evans, P. A. J. Am. Chem. Soc. 2005, 127, 1602.
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    • CCDC 690610(3a) contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/ data-request/cif. See the Supporting Information for a figure of its X-ray structure.
    • CCDC 690610(3a) contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/ data-request/cif. See the Supporting Information for a figure of its X-ray structure.
  • 47
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    • The [2+2+2+2] process has been found to be favored at a large loading amount of Ni catalyst for the dimerization of terminal 1,6-diynes, see ref. 10.
    • The [2+2+2+2] process has been found to be favored at a large loading amount of Ni catalyst for the dimerization of terminal 1,6-diynes, see ref. 10.
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    • 2Zn were used, the reaction failed to proceed.
    • 2Zn were used, the reaction failed to proceed.
  • 49
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    • For examples of similar phenomena: Tamao, K, Kobayashi, K, Ito, Y. J. Am. Chem. Soc. 1988, 110, 1286; and ref. 7
    • For examples of similar phenomena: Tamao, K.; Kobayashi, K.; Ito, Y. J. Am. Chem. Soc. 1988, 110, 1286; and ref. 7.
  • 50
    • 67649951574 scopus 로고    scopus 로고
    • CCDC 690609(2h) contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/ data-request/cif. See the Supporting Information for a figure of its X-ray structure.
    • CCDC 690609(2h) contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/ data-request/cif. See the Supporting Information for a figure of its X-ray structure.
  • 57
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    • In ref. 7, the authors also proposed that oligomerization may be the possible reason for the decreased yield with 1j
    • In ref. 7, the authors also proposed that oligomerization may be the possible reason for the decreased yield with 1j.
  • 58
    • 18244392211 scopus 로고    scopus 로고
    • For selected examples for the reductive cyclization of unactivated 1,6-enynes using Rh and Ti catalysts, see: (a) Jang, H.-Y.; Hughes, F. W.; Gong, H.; Zhang, J.; Brodbelt, J. S.; Krische, M. J. J. Am. Chem. Soc. 2005, 127, 6174.
    • For selected examples for the reductive cyclization of unactivated 1,6-enynes using Rh and Ti catalysts, see: (a) Jang, H.-Y.; Hughes, F. W.; Gong, H.; Zhang, J.; Brodbelt, J. S.; Krische, M. J. J. Am. Chem. Soc. 2005, 127, 6174.
  • 61
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    • 3 or (R)-BINAP did not improve the product selectivity significantly.
    • 3 or (R)-BINAP did not improve the product selectivity significantly.
  • 62
    • 67649939082 scopus 로고    scopus 로고
    • Typical Procedure for the Dimerization of 1 with NiII/ Me2Zn Combination Under an atmosphere of argon, 3.2 mg (0.012 mmol) of Ni(acac)2 were added to a Schlenk tube, and the system was purged with argon three times. Then enyne 1a (86 mg, 0.3 mmol) in 3.0 mL of freshly distilled THF was added via a syringe followed by the addition of Me2Zn 0.3 mmol (1.2 M in toluene) in one portion [in the case of NiCl2(PCy3, Me2Zn was added at reflux, The reaction mixture was stirred for 1 h at r.t. before being quenched with sat. aq NH 4Cl soln. Then, the mixture was extracted with CH2Cl 2 (3 x 3 mL, dried with anhyd Na2SO4. After removal of the solvent in vacuum, the residue was purified by column chromatography (silica gel, PE-Et2O, 4:1) to provide the desired products 2a and 3a, 5E,10E)-Tetramethyl-5,10- diphenyl-3a,4,8
    • +: 595.2316 ± 0.002; found: 595.2302.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.