메뉴 건너뛰기




Volumn 132, Issue 3, 2010, Pages 967-979

Conformationally gated fragmentations and rearrangements promoted by interception of the bergman cyclization through intramolecular H-abstraction: A possible mechanism of auto-resistance to natural enediyne antibiotics?

Author keywords

[No Author keywords available]

Indexed keywords

ALTERNATIVE PATH; ANTITUMOR ANTIBIOTICS; BENZYNE; BERGMAN CYCLIZATION; BERGMAN CYCLOAROMATIZATION; CONFORMATIONAL CONTROL; CYCLOHEXADIENES; ENEDIYNES; GEM-DIMETHYL; H-ABSTRACTION; H-ATOM ABSTRACTION; HYDROGEN ATOMS; NEW APPROACHES; PLAUSIBLE MECHANISMS; REACTION CONDITIONS; STABLE RADICALS; SUBSTITUTION PATTERNS; THORPE-INGOLD EFFECT;

EID: 76149095686     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja905100u     Document Type: Article
Times cited : (55)

References (137)
  • 8
  • 11
    • 0003815528 scopus 로고
    • Borders, D. B, Doyle, T. W, Eds, Marcel Dekker: New York
    • (a) Enediyne Antibiotics as Antitumor Agents; Borders, D. B., Doyle, T. W., Eds.; Marcel Dekker: New York, 1995.
    • (1995) Enediyne Antibiotics as Antitumor Agents
  • 58
    • 0033579184 scopus 로고    scopus 로고
    • and references thereinSee also: (b) Hrovat, D. A.; Beno, B. R.; Lange, H.; Yoo, H.-Y.; Houk, K. N.; Borden, W. T. J. Am. Chem. Soc. 1999, 121, 10529.
    • and references thereinSee also: (b) Hrovat, D. A.; Beno, B. R.; Lange, H.; Yoo, H.-Y.; Houk, K. N.; Borden, W. T. J. Am. Chem. Soc. 1999, 121, 10529.
  • 62
    • 0141991442 scopus 로고    scopus 로고
    • Thermal loss of the THP group at similar temperatures has been reportedbyPinheyetal.formanyTHP-protectedphenolderivatives.Pinhey, J. T.; Xuan, P. T. Aust. J. Chem. 1988, 41, 69. Control experiments suggest that the Bergman cyclization of unprotected enediyne 10 is slower than that of 2 and that the thermal O-THP deprotection occurs mostly (∼60%) after the Bergman cyclization of enediyne 2. Based on these experiments (described in the SI), one can evaluate that 40% of 1-naphthol 11 is formed from the Bergman cyclization of the deprotected phenol 10 whereas 60% of the naphthol is formed from the O-THF naphthol 7.
    • Thermal loss of the THP group at similar temperatures has been reportedbyPinheyetal.formanyTHP-protectedphenolderivatives.Pinhey, J. T.; Xuan, P. T. Aust. J. Chem. 1988, 41, 69. Control experiments suggest that the Bergman cyclization of unprotected enediyne 10 is slower than that of 2 and that the thermal O-THP deprotection occurs mostly (∼60%) after the Bergman cyclization of enediyne 2. Based on these experiments (described in the SI), one can evaluate that 40% of 1-naphthol 11 is formed from the Bergman cyclization of the deprotected phenol 10 whereas 60% of the naphthol is formed from the O-THF naphthol 7.
  • 89
    • 76149125773 scopus 로고    scopus 로고
    • A large number of minor unidentified products in <1-2% yields are detected by the GC analysis (see the SI section).
    • A large number of minor unidentified products in <1-2% yields are detected by the GC analysis (see the SI section).
  • 105
    • 76149142148 scopus 로고    scopus 로고
    • Because no water was present in our reaction mixtures, our experiments do not exclude the mechanism illustrated for the Esperamicin/DNA system, in Scheme 12. Instead, our results suggest that alternative fragmentation pathways are viable. Our findings also indicate that such fragmentations may not be limited to esperamicins but may occur in other natural enediynes, equipped with similar carbohydrate moieties.
    • Because no water was present in our reaction mixtures, our experiments do not exclude the mechanism illustrated for the Esperamicin/DNA system, in Scheme 12. Instead, our results suggest that alternative fragmentation pathways are viable. Our findings also indicate that such fragmentations may not be limited to esperamicins but may occur in other natural enediynes, equipped with similar carbohydrate moieties.
  • 118
    • 0037181391 scopus 로고    scopus 로고
    • For a general analysis of orbital interactions involving R-bonds, see: d
    • For a general analysis of orbital interactions involving R-bonds, see: (d) Alabugin, I. V.; Zeidan, T. A. J. Am. Chem. Soc. 2002, 124, 3175.
    • (2002) J. Am. Chem. Soc , vol.124 , pp. 3175
    • Alabugin, I.V.1    Zeidan, T.A.2
  • 123
    • 0042208364 scopus 로고    scopus 로고
    • Application of Marcus theory to pericyclic reactions: (d) Alabugin, I. V.; Manoharan, M.; Breiner, B.; Lewis, F. J. Am. Chem. Soc. 2003, 125, 9329.
    • Application of Marcus theory to pericyclic reactions: (d) Alabugin, I. V.; Manoharan, M.; Breiner, B.; Lewis, F. J. Am. Chem. Soc. 2003, 125, 9329.
  • 124
    • 24744453294 scopus 로고    scopus 로고
    • Radical cyclizations: (e) Alabugin, I. V.; Manoharan, M. J. Am. Chem. Soc. 2005, 127, 12583.
    • Radical cyclizations: (e) Alabugin, I. V.; Manoharan, M. J. Am. Chem. Soc. 2005, 127, 12583.
  • 137
    • 0141707096 scopus 로고    scopus 로고
    • Ten-membered enediynes are less reactive and can be isolated without the protection provided by their apoprotein complexes. However, interaction of these molecules with regulating proteins may play an important role for their reactivity, as illustrated by the recent report of resistance to calicheamicin mediated by CalC protein: Biggins, J. B, Onwueme, K. C, Thorson, J. S. Science 2003, 301, 1537
    • Ten-membered enediynes are less reactive and can be isolated without the protection provided by their apoprotein complexes. However, interaction of these molecules with regulating proteins may play an important role for their reactivity, as illustrated by the recent report of resistance to calicheamicin mediated by CalC protein: Biggins, J. B.; Onwueme, K. C.; Thorson, J. S. Science 2003, 301, 1537.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.