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Volumn 68, Issue 1, 2003, Pages 11-14

Borane-mediated aldol cycloreduction of monoenone monoketones: Diastereoselective formation of quaternary centers

Author keywords

[No Author keywords available]

Indexed keywords

MONOENONE MONOKETONES;

EID: 0037428016     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo020629f     Document Type: Article
Times cited : (38)

References (37)
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    • Kiyooka, S.1    Shimizu, A.2    Torii, S.3
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    • Taylor, S.J.1    Morken, J.P.2
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    • For catalytic reductive aldol processes, see: (a) Revis, A.; Hilty, T. K. Tetrahedron Lett. 1987, 28, 4809. (b) Matsuda, I.; Takahashi, K.; Sato, S. Tetrahedron Lett. 1990, 31, 5331. (c) Isayama, S.; Mukaiyama, T. Chem. Lett. 1989, 2005. (d) Kiyooka, S.; Shimizu, A.; Torii, S. Tetrahedron Lett. 1998, 39, 5237. (e) Ooi, T.; Doda, K.; Sakai, D.; Maruoka, K. Tetrahedron Lett. 1999, 40, 2133. (f) Taylor, S. J.; Morken, J. P. J. Am. Chem. Soc. 1999, 121, 12202. (g) Taylor, S. J.; Duffey, M. O.; Morken, J. P. J. Am. Chem. Soc. 2000, 122, 4528. (h) Zhao, C.-X.; Duffey, M. O.; Taylor, S. J.; Morken, J. P. Org. Lett. 2001, 3, 1829.
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    • Baik, T.-G.; Luiz, A. L.; Wang, L.-C.; Krische, M. J. J. Am. Chem. Soc. 2001, 123, 5112. A nonstereoselective catalytic aldol cycloreduction was subsequently reported: Emiabata-Smith, D.; McKillop, A.; Mills, C.; Motherwell, W. B.; Whitehead, A. J. Synlett 2001, 1302.
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    • For selected reviews on boron enolates, see: (a) Paterson, I.; Doughty, V. A.; Florence, G.; Gerlach, K.; McLeod, M. D.; Scott, J. P.; Trieselmann, T. ACS Symposium Series 783; American Chemical Society: Washington, DC, 2001; p 195. (b) Cowden, C. J.; Paterson, I. Org. React. 1997, 51, 1. (c) Gennari, C. Pure Appl. Chem. 1997, 69, 507. (d) Paterson, I. Chem. Ind. 1988, 12, 390. (e) Evans, D. A.; Nelson, J. V.; Taber, T. R. Top. Stereochem. 1982, 13, 1.
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    • For selected reviews on boron enolates, see: (a) Paterson, I.; Doughty, V. A.; Florence, G.; Gerlach, K.; McLeod, M. D.; Scott, J. P.; Trieselmann, T. ACS Symposium Series 783; American Chemical Society: Washington, DC, 2001; p 195. (b) Cowden, C. J.; Paterson, I. Org. React. 1997, 51, 1. (c) Gennari, C. Pure Appl. Chem. 1997, 69, 507. (d) Paterson, I. Chem. Ind. 1988, 12, 390. (e) Evans, D. A.; Nelson, J. V.; Taber, T. R. Top. Stereochem. 1982, 13, 1.
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    • For selected reviews on boron enolates, see: (a) Paterson, I.; Doughty, V. A.; Florence, G.; Gerlach, K.; McLeod, M. D.; Scott, J. P.; Trieselmann, T. ACS Symposium Series 783; American Chemical Society: Washington, DC, 2001; p 195. (b) Cowden, C. J.; Paterson, I. Org. React. 1997, 51, 1. (c) Gennari, C. Pure Appl. Chem. 1997, 69, 507. (d) Paterson, I. Chem. Ind. 1988, 12, 390. (e) Evans, D. A.; Nelson, J. V.; Taber, T. R. Top. Stereochem. 1982, 13, 1.
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    • note
    • 2, and triphenylphosphine (30.4 mmol, 100 mol %) was added; the reaction mixture was allowed to stir for 2 h at 25°C. At this point, the appropriate Wittig reagent (30.4 mmol, 100 mol %) was added in portions over 10 min and the solution stirred for 18 h. The residue was evaporated onto silica and subjected to column chromatography to afford monoenone monoketones 1a-5a.
  • 34
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    • note
    • 2 (200 mL, 0.091 M), and the acetophenone-derived Wittig reagent (18.2 mmol, 100 mol %) was added in portions over 10 min; the solution was allowed to stir for 18 h. The residue was evaporated onto silica and subjected to column chromatography to afford the monoenone monoketone 6a (4.75 g, 86% yield) as a clear colorless oil.
  • 36
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    • See Supporting Information for crystallographic data
    • See Supporting Information for crystallographic data.


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