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Volumn 76, Issue 6, 2011, Pages 1662-1672

A Practical synthesis of 3-Acyl cyclobutanones by [2 〈 2] annulation. Mechanism and utility of the zn(II)-Catalyzed condensation of r-Chloroenamines with electron-deficient alkenes

Author keywords

[No Author keywords available]

Indexed keywords

AB INITIO CALCULATIONS; AMBIENT TEMPERATURES; CYCLOADDITION REACTION; CYCLOBUTANONES; DUAL ROLE; ELECTRON-DEFICIENT; QUATERNARY CARBON; TERTIARY AMIDES; UNSATURATED CARBONYL COMPOUNDS;

EID: 79953873667     PISSN: 00223263     EISSN: 15206904     Source Type: Journal    
DOI: 10.1021/jo102257k     Document Type: Article
Times cited : (21)

References (54)
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    • (b) For details on a stereocontrolled approach to tetrasubstituted cyclobutanes and its applications in synthesis, see: (b) Baran, P. S.; Li, K.; O'Malley, D. P.; Mitsos, C. Angew. Chem., Int. Ed. 2006, 45, 249-252.
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  • 4
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    • (d) For Brønsted or Lewis acid-catalyzed [2 〈 2] cyclizations based on tandem Michael- Aldol sequences, see: (d) Inanaga, K.; Takasu, K.; Ihara, M. J. Am. Chem. Soc. 2005, 127, 3668-3669.
    • (2005) J. Am. Chem. Soc , vol.127 , pp. 3668-3669
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    • (c) Hoffman, N. Chem. Rev. 2008, 108, 1052- 1103.
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    • Hoffman, N.1
  • 13
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    • For synthetic studies toward providencin, see: (b) Bray, C. D.; Pattenden, G. Tetrahedron Lett. 2006, 47, 3937-3939.
    • (2006) Tetrahedron Lett , vol.47 , pp. 3937-3939
    • Bray, C.D.1    Pattenden, G.2
  • 17
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    • A recent review on the chemistry of furanocembranes and pseudopteranes: (f) Roethle, P. A.; Trauner, D. Nat. Prod. Rep. 2008, 25, 298- 317.
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  • 21
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    • Other catalytic entries to [2 〈 2] cycloaddition rely on ynamide functionality; see: (a) Li, H.; Hsung, R. P.; DeKorver, K. A.; Wei, Y. Org. Lett. 2010, 12, 3780-3783.
    • (2010) Org. Lett , vol.12 , pp. 3780-3783
    • Li, H.1    Hsung, R.P.2    Dekorver, K.A.3    Wei, Y.4
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    • For a review, see: (a) Snider, B. B. Chem. Rev. 1988, 88, 793-811.
    • (1988) Chem. Rev , vol.88 , pp. 793-811
    • Snider, B.B.1
  • 31
    • 33750454101 scopus 로고    scopus 로고
    • For an application in total synthesis relying on unconventional conditions for ketene formation, see: (b) Mushti, C. S.; Kim, J.-H.; Corey, E. J. J. Am. Chem. Soc. 2006, 128, 14050-14052.
    • (2006) J. Am. Chem. Soc , vol.128 , pp. 14050-14052
    • Mushti, C.S.1    Kim, J.-H.2    Corey, E.J.3
  • 39
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    • Other Lewis acids screened include AlCl3, TiCl4, SnCl4, and Sc(OTf) 3
    • Other Lewis acids screened include AlCl3, TiCl4, SnCl4, and Sc(OTf) 3.
  • 40
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    • For other representative examples of [2 〈 2] cycloaddition reactions that benefit from ultrasonic activation, see: (a) Ref 7g
    • For other representative examples of [2 〈 2] cycloaddition reactions that benefit from ultrasonic activation, see: (a) Ref 7g.
  • 42
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    • A competing oligomerization of the acrylic ester may account for the diminished yield in these cases since a highly polar yet intractable fraction is visible as a baseline spot in the TLC of the crude reaction mixtures
    • A competing oligomerization of the acrylic ester may account for the diminished yield in these cases since a highly polar yet intractable fraction is visible as a baseline spot in the TLC of the crude reaction mixtures.
  • 45
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    • Our attempt to use a stereoisomeric mixture of the β-benzyl, N, N-dimethyl α-chloroenamine without isolation was not successful, presumably due to competing oligomerization of this reactant at the warmer temperatures required for cyclocondensation. In addition, N,Ndiethyl- 2-phenylpropanamide failed to chlorinate efficiently under standard conditions with oxalyl chloride, presumably due to steric hindrance
    • Our attempt to use a stereoisomeric mixture of the β-benzyl, N, N-dimethyl α-chloroenamine without isolation was not successful, presumably due to competing oligomerization of this reactant at the warmer temperatures required for cyclocondensation. In addition, N,Ndiethyl- 2-phenylpropanamide failed to chlorinate efficiently under standard conditions with oxalyl chloride, presumably due to steric hindrance.
  • 46
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    • Checkers of the Organic Syntheses prep (ref 18a) also observed that early fractions of 7 boiling at 100-125 °C were mixtures of product and triethylamine
    • Checkers of the Organic Syntheses prep (ref 18a) also observed that early fractions of 7 boiling at 100-125 °C were mixtures of product and triethylamine.
  • 48
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    • The intermediates play a role in other reactions that begin with protonation or alkylation of nucleophilic ynamides. See: (a) Zhang, Y.; Hsung, R. P.; Zhang, X.; Huang, J.; Slafer, B. W.; Davis, A. Org. Lett. 2005, 7, 1047-1050 for a specific example.
    • (2005) Org. Lett , vol.7 , pp. 1047-1050
    • Zhang, Y.1    Hsung, R.P.2    Zhang, X.3    Huang, J.4    Slafer, B.W.5    Davis, A.6


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