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Volumn 10, Issue 21, 2008, Pages 4839-4842

Rhenium(VII) catalysis of prins cyclization reactions

Author keywords

[No Author keywords available]

Indexed keywords

ALDEHYDE; RHENIUM;

EID: 58149159597     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol8019204     Document Type: Article
Times cited : (77)

References (46)
  • 6
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    • For several other related applications of high-oxidation Re catalysts in synthesis, see: a
    • For several other related applications of high-oxidation Re catalysts in synthesis, see: (a) Ishihara, K.; Furuya, Y.; Yamamoto, H. Angew. Chem., Int. Ed. 2002, 41, 2983-2986.
    • (2002) Angew. Chem., Int. Ed , vol.41 , pp. 2983-2986
    • Ishihara, K.1    Furuya, Y.2    Yamamoto, H.3
  • 11
    • 0001290261 scopus 로고
    • Trost, B. M, Fleming, I, Heathcock, C. H, Eds, Pergamon Press: New York
    • (b) Snider, B. B. In Comprehensive Organic Synthesis; Trost, B. M., Fleming, I., Heathcock, C. H., Eds.; Pergamon Press: New York, 1991: Vol. 2, pp 527-561.
    • (1991) Comprehensive Organic Synthesis , vol.2 , pp. 527-561
    • Snider, B.B.1
  • 14
    • 84981754264 scopus 로고
    • (a) Hanschke, E. Chem. Ber. 1955, 88, 1053-1061.
    • (1955) Chem. Ber , vol.88 , pp. 1053-1061
    • Hanschke, E.1
  • 34
    • 33845555896 scopus 로고    scopus 로고
    • 2:
    • 2:
  • 38
    • 60949090709 scopus 로고    scopus 로고
    • This result stands in contrast to our Prins reaction approach to kendomycin, where an electron-rich aromatic ring led to side-chain exchange products as the major component in a TFA/DCM promoted reaction ref 13
    • This result stands in contrast to our Prins reaction approach to kendomycin, where an electron-rich aromatic ring led to side-chain exchange products as the major component in a TFA/DCM promoted reaction (ref 13).
  • 40
    • 60949111581 scopus 로고    scopus 로고
    • The aliphatic aldehyde oxonia-Cope rearrangement evident in Scheme 2 should be thermoneutral, whereas the aromatic oxonia-Cope should favor the aromatic oxocarbenium ion. In theory, this effect might suppress oxonia-Cope side reactions with aromatic aldehydes, but in our experience, it does not, perhaps because of a slower Prins cyclization with aromatic aldehydes. See ref 13 for an example
    • The aliphatic aldehyde oxonia-Cope rearrangement evident in Scheme 2 should be thermoneutral, whereas the aromatic oxonia-Cope should favor the aromatic oxocarbenium ion. In theory, this effect might suppress oxonia-Cope side reactions with aromatic aldehydes, but in our experience, it does not, perhaps because of a slower Prins cyclization with aromatic aldehydes. See ref 13 for an example.
  • 44
    • 60949092649 scopus 로고    scopus 로고
    • A Prins reaction between alcohol 1 and cinnamaldehyde led to the expected product in 40% yield and the side-chain exchanged product 7 in 18% yield. Further work needs to be done to make Prins reactions with terminal alkenes practical.
    • A Prins reaction between alcohol 1 and cinnamaldehyde led to the expected product in 40% yield and the side-chain exchanged product 7 in 18% yield. Further work needs to be done to make Prins reactions with terminal alkenes practical.
  • 45
    • 0026632208 scopus 로고    scopus 로고
    • The wet reaction was run in water-saturated DCM. At 27°C, the concentration of water would be 0.137 M (0.186 wt %): Stephenson, R. M. J. Chem. Eng. Data 1992, 37, 80-95 With a catalyst concentration of 0.005 M, the molar ratio of water/Re(VII) would be ca, 27:1, For comparison, the molar ratio of commercial 70 wt % perrhenic acid is about 6:1 water/Re(VII). Presumably the difference in the water concentration led to the difference in outcome.
    • The "wet" reaction was run in water-saturated DCM. At 27°C, the concentration of water would be 0.137 M (0.186 wt %): Stephenson, R. M. J. Chem. Eng. Data 1992, 37, 80-95 With a catalyst concentration of 0.005 M, the molar ratio of water/Re(VII) would be ca, 27:1, For comparison, the molar ratio of commercial 70 wt % perrhenic acid is about 6:1 water/Re(VII). Presumably the difference in the water concentration led to the difference in outcome.


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