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Volumn 126, Issue 2, 2004, Pages 470-471

New Fischer Carbene Complexes of Rhodium(I): Preparation and 2-Cyclopentenone Ring Synthesis by Annelation to Alkynes

Author keywords

[No Author keywords available]

Indexed keywords

ALKYNE; CARBENOID; CYCLOPENTENONE DERIVATIVE; RHODIUM COMPLEX;

EID: 0347717614     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja038817q     Document Type: Article
Times cited : (79)

References (48)
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    • Recent reviews: (a) Wulff, W. D. In Comprehensive Organometallic Chemistry II; Abel, E. W., Stone, F. G. A., Wilkinson, G., Eds.; Pergamon: New York, 1995; Vol. 12, p 469.
    • (1995) Comprehensive Organometallic Chemistry II , vol.12 , pp. 469
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  • 19
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    • For the synthesis of rhodium(I) zirconoxycarbene complexes, see: (a) Barger, P. T.; Bercaw, J. E. Organometallics 1984, 3, 278.
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    • Barger, P.T.1    Bercaw, J.E.2
  • 22
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    • note
    • Compound 3b shows a square planar coordination at the rhodium(I) center with a rhodium-carbene carbon and Rh-CO bond lengths of 1.993(9) and 1.901(10). Å. respectively. Details are given in the Supporting Information. Compounds 3.4, and 6-8 were characterized spectrospically and by elemental analysis. The structures of 4 and 6-8 were ascertained by NMR experiments (including HMQC, HMBC, COSY, and NOESY). The enol ethers, precursors of the final cyclopentenones, are detected by NMR in the reaction crude before chromatographic purification.
  • 23
  • 30
    • 0000036185 scopus 로고    scopus 로고
    • The [3 + 2] cyclization of alkynes to metal carbenes leading to substituted cyclopentadienes has been reported for the particular case of group 6 β-aminoalkenyl(alkoxy)carbene complexes. See: (a) de Meijere, A.; Shirmer, H.; Duetsch, M. Angew. Chem., Int. Ed. 2000, 39, 3964.
    • (2000) Angew. Chem., Int. Ed. , vol.39 , pp. 3964
    • De Meijere, A.1    Shirmer, H.2    Duetsch, M.3
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    • Reference 3
    • (c) Reference 3.
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    • Electron-poor alkynes react with alkenyl(alkoxy)carbenes of chromium yielding mixtures of bicyclic lactones (Halban-White cyclization) and phenols depending on the nature of the activating group: (a) Wulff, W. D.; Chan, K.-S.; Tang, P.-C. J. Org. Chem. 1984, 49, 2293.
    • (1984) J. Org. Chem. , vol.49 , pp. 2293
    • Wulff, W.D.1    Chan, K.-S.2    Tang, P.-C.3
  • 37
    • 0002102792 scopus 로고    scopus 로고
    • For an interesting discussion on the intramolecular reaction of diazo derivatives and unactivated alkynes catalyzed by rhodium(II). see: Padwa, A. J. Organomet. Chem. 2001, 617-618, 3.
    • (2001) J. Organomet. Chem. , vol.617-618 , pp. 3
    • Padwa, A.1
  • 38
    • 0000960755 scopus 로고
    • For previous examples of 1-metalla-1,3-dienes in [4 + 21 cycloadditions. see: (a) Trost, B. M.; Hashmi, S. K. J. Am. Chem. Soc. 1994, 116, 2183.
    • (1994) J. Am. Chem. Soc. , vol.116 , pp. 2183
    • Trost, B.M.1    Hashmi, S.K.2
  • 42
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    • For an excellent theoretical study on 1.2- and 1.4-cycloaddition reactions of rhodiabenzene complexes, see: (e) Iron, M. A.; Martin, J. M. L.; van der Boom, M. E. J. Am. Chem. Soc. 2003, 125, 11702.
    • (2003) J. Am. Chem. Soc. , vol.125 , pp. 11702
    • Iron, M.A.1    Martin, J.M.L.2    Van Der Boom, M.E.3
  • 43
    • 0000936113 scopus 로고    scopus 로고
    • The vinyl rhodiacyclobutene formation/1,3-rearrangement sequence might be also acceptable. See: Padwa, A.; Kassir, J. M.; Xu. S. L. J. Org. Chem. 1997, 62, 1642. A carbene/alkyne insertion mechanism apparently would not explain the observed regiochemistry.
    • (1997) J. Org. Chem. , vol.62 , pp. 1642
    • Padwa, A.1    Kassir, J.M.2    Xu, S.L.3
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    • and references therein
    • In a different approach, 3-methoxycyclopentenones result from neutral alkynes and cyclopropyl(methoxy)carbenes of chromium. See: Herndon, J. W.; Zu, J. Org. Lett. 1999, 1, 15 and references therein.
    • (1999) Org. Lett. , vol.1 , pp. 15
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  • 47
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    • For an intermolecular reaction involving electron-poor and strained alkenes, see, respectively: (c) Ahmar, M.; Antras, F.; Cazes, B. Tetrahedron Lett. 1999, 40, 5503.
    • (1999) Tetrahedron Lett. , vol.40 , pp. 5503
    • Ahmar, M.1    Antras, F.2    Cazes, B.3


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