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Volumn 69, Issue 2, 2004, Pages 395-405

Rhodium Complex-Catalyzed Cycloisomerization of Allenenes: Exo and Endo Cyclization Depending on the Auxiliary Ligands

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSIS; ISOMERIZATION; RHODIUM COMPOUNDS; STEREOCHEMISTRY;

EID: 0345871949     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo035551x     Document Type: Article
Times cited : (64)

References (218)
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    • For applications to total syntheses of natural products, see: (a) Trost, B. M.; Chung, J. Y. L. J. Am. Chem. Soc. 1985, 107, 4586-4588.
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    • and also see refs 18bce and 19c
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    • Wender and co-workers also applied the rhodium-catalyzed reaction to total syntheses of natural products, see: (d) Wender, P. A.; Fuji, M.; Husfeld, C. O.; Love, J. A. Org. Lett. 1999, 1, 137-139.
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    • Cf. for the stoichiometric [2+2] cycloaddition with molybdenum complexes, see: (g) Shen, Q.; Hammond, G. B. J. Am. Chem. Soc. 2002, 124, 6534-6535.
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    • For transition metal-promoted [2+2+1] cycloaddition of allenynes, see the following. Mo, Co, and Zr: (a) Kent, J. L.; Wan, H.; Brummond, K. M. Tetrahedron Lett. 1995, 36, 2407-2410.
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    • Brummond and coworkers applied the molybdenum-mediated reaction to total syntheses of natural products, see: (f) Brummond, K. M.; Lu, J. J. Am. Chem. Soc. 1999, 121, 5087-5088.
    • (1999) J. Am. Chem. Soc. , vol.121 , pp. 5087-5088
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    • It was also disclosed that a stoichiometric amount of the cobalt complex promoted the intermolecular allenic Pauson-Khand reaction, see: (a) Ahmar, M.; Antras, F.; Cazes, B. Tetrahedron Lett. 1995, 36, 4417-4420.
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    • Previously, Trost et al. investigated the related ruthenium-catalyzed intermolecular couplings of allenes and alkenes derived from vinyl ketones to provide 1,3-dienes, see: (a) Trost, B. M.; Pinkerton, A. B. J. Am. Chem. Soc. 1999, 121, 4068-4069.
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    • note
    • The conversion and the purity were determined by GC analysis of the reaction mixture and the isolated product 2, respectively. The recovered allenene 1 was included in the impurity.
  • 196
    • 0346559949 scopus 로고    scopus 로고
    • note
    • Almost pure 6 was readily obtained by recrystallization from ethyl acetate/n-hexane.
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    • note
    • In the case of the rhodium-catalyzed cycloisomerization of allenynes, the allene moiety coordinates to the rhodium(I) center at the external allenic π-bond to form the metallacycle intermediate, see refs 32a,b.
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    • note
    • No isomerization of the Z isomer to the more thermodynamically stable E isomer was observed under the reaction conditions.
  • 202
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    • note
    • Similar observations were reported in the rhodium- and platinum-catalyzed [4+1] cycloaddition of vinylallenes and the iridium-catalyzed [5+1] cycloaddition of allenylcyclopropanes, see refs 27f,j,k.
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    • note
    • Recently, Trost et al. reported the formation of exo-alkylidenecycloheptenes by the rutheniun-catalyzed cycloisomerization of 1,6-enynes, see refs 5c,e.
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    • note
    • 2 behaved as an effective catalyst to give 34 in 74% yield.
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    • Desilylation of α-silyl ketone trans,cis-39 might proceed via the corresponding enol silyl ether under thermal or catalytic condition to provide trans-40, see: Matsuda, I.; Sato, S.; Hattori, M.; Izumi, Y. Tetrahedron Lett. 1985, 26, 3215-3218.
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    • note
    • The stereochemistry for both trans,cis-39 and trans-40 was estimated from the NOESY spectra, respectively.
  • 214
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    • note
    • More increase of CO pressure inhibited incorporation of carbon monoxide to give undesirable isomers.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.