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Volumn 72, Issue 18, 2007, Pages 6753-6757

Gold-catalyzed synthesis of bicyclo[4.3.0]nonadiene derivatives via tandem 6-endo-dig/Nazarov cyclization of 1,6-allenynes

Author keywords

[No Author keywords available]

Indexed keywords

GOLD CATALYZED SYNTHESIS; NONADIENE DERIVATIVES; SUBSTRATE BEARINGS;

EID: 34548757875     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo0707939     Document Type: Article
Times cited : (77)

References (52)
  • 20
    • 33644949668 scopus 로고    scopus 로고
    • 6 as catalysts see: (a) Genin, E.; Toullec, P. Y.; Antoniotti, S.; Brancour, C.; Genêt, J.-P.; Michelet, V. J. Am. Chem. Soc. 2006, 128, 3112.
    • 6 as catalysts see: (a) Genin, E.; Toullec, P. Y.; Antoniotti, S.; Brancour, C.; Genêt, J.-P.; Michelet, V. J. Am. Chem. Soc. 2006, 128, 3112.
  • 27
    • 33846630397 scopus 로고    scopus 로고
    • For 5- or 6-endo-dig catalytic cyclization triggered by a π-phenylacetylene intermediate, see selected examples: (a) Harrison, T. J.; Patrick, B. O.; Dake, G. R. Org. Lett. 2007, 9, 367.
    • For 5- or 6-endo-dig catalytic cyclization triggered by a π-phenylacetylene intermediate, see selected examples: (a) Harrison, T. J.; Patrick, B. O.; Dake, G. R. Org. Lett. 2007, 9, 367.
  • 38
    • 34548801485 scopus 로고    scopus 로고
    • 1H NOE map of key compounds and X-ray data of compound 5j are provided in the Supporting Information.
    • 1H NOE map of key compounds and X-ray data of compound 5j are provided in the Supporting Information.
  • 44
    • 34548765628 scopus 로고    scopus 로고
    • Formation of cyclopentyl phenyl ketone 4 is thought to arise from Au(I)-π-allene intermediate, which initiates a 5-exo-trig cyclization to form vinyl cation E, and ultimately producing desired ketone 4 upon water attack. The uncommon feature of this cyclization is the nature of the Au(I)-π-allene intermediate, which is characterized also by resonance structure D′ such that an intramolecular attack occurs at the terminal allene carbon (Chemical Equation Presented)
    • Formation of cyclopentyl phenyl ketone 4 is thought to arise from Au(I)-π-allene intermediate, which initiates a 5-exo-trig cyclization to form vinyl cation E, and ultimately producing desired ketone 4 upon water attack. The uncommon feature of this cyclization is the nature of the Au(I)-π-allene intermediate, which is characterized also by resonance structure D′ such that an intramolecular attack occurs at the terminal allene carbon (Chemical Equation Presented)
  • 45
    • 33846675942 scopus 로고    scopus 로고
    • For catalytic cyclization via a π-allene intermediate, see: a
    • For catalytic cyclization via a π-allene intermediate, see: (a) Lee, J. H.; Toste, F. D. Angew. Chem., Int. Ed. 2007, 46, 912.
    • (2007) Angew. Chem., Int. Ed , vol.46 , pp. 912
    • Lee, J.H.1    Toste, F.D.2
  • 52
    • 34548758648 scopus 로고    scopus 로고
    • 15 one alternative mechanism involves initial Nazarov cyclization, followed by 6-endo-dig cyclization of π-alkyne H as depicted below; the initial intermediate is Au(I)-π-allene intermediate F′, which activates indene formation to give species G. After protodeauration, a subsequent 6-endo-dig cyclization of alkyne intermediate H provides the desired bicyclo[4.3.0]nonadiene 5a. This pathway, however, is opposed by formation of cyclopentol 6, which indicates initial formation of a cyclopentene ring rather than the indene ring. (Chemical Equation Presented)
    • 15 one alternative mechanism involves initial Nazarov cyclization, followed by 6-endo-dig cyclization of π-alkyne H as depicted below; the initial intermediate is Au(I)-π-allene intermediate F′, which activates indene formation to give species G. After protodeauration, a subsequent 6-endo-dig cyclization of alkyne intermediate H provides the desired bicyclo[4.3.0]nonadiene 5a. This pathway, however, is opposed by formation of cyclopentol 6, which indicates initial formation of a cyclopentene ring rather than the indene ring. (Chemical Equation Presented)


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.