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Volumn 65, Issue 10, 2000, Pages 3252-3254

An oxidative Prins cyclization methodology

Author keywords

[No Author keywords available]

Indexed keywords

HETEROCYCLIC AMINE;

EID: 0034685873     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo0000832     Document Type: Note
Times cited : (54)

References (36)
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    • note
    • (a) Oxidation potentials of α-stannyl ethers are in the range of 1.1-1.2 V (ref 7b), and the reduction potential of Ce(IV) is ca. 1.7 V (ref 7c).
  • 26
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    • (a) Prepared by Swern oxidation of the known alcohol: Lee, T. V.; Channon, J. A.; Cregg, C.; Porter, J. R.; Roden, F. S.; Yeoh, H. T. L. Tetrahedron 1989, 45, 5877. (b) Prepared by using the procedure described in Dehmlow, E. V.; Makrandi, J. K. J. Chem. Res., Synop. 1986, 32.
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  • 27
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    • (a) Prepared by Swern oxidation of the known alcohol: Lee, T. V.; Channon, J. A.; Cregg, C.; Porter, J. R.; Roden, F. S.; Yeoh, H. T. L. Tetrahedron 1989, 45, 5877. (b) Prepared by using the procedure described in Dehmlow, E. V.; Makrandi, J. K. J. Chem. Res., Synop. 1986, 32.
    • (1986) J. Chem. Res., Synop. , pp. 32
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  • 30
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    • note
    • (a) Similar arguments have been advanced to explain the stereochemistry of seven-membered ring-forming Prins cyclizations (ref 3b) and sequential Prins-Pinacol reactions (ref 10b).
  • 32
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    • note
    • (a) The stereochemistry of 31, for example, is assigned as cis on the basis of the observed 5.5 Hz coupling constant for the H-2 and H-3 protons and comparisons to the reported (ref 3g) 7.0 Hz coupling in closely related cis-2-phenyl-3-vinyltetrahydrofuran. In addition, the strong preference for cis-tetrahydrofuran formation in 5-exo-Prins cyclizations has been noted ealier by Oriyama (ref 3g) and Hoffmann (ref 11b).
  • 34
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    • note
    • (a) The dioxolane moiety is retained in these processes despite the report that CAN in MeCN at 70 °C effectively deprotects cyclic acetals and ketals (ref 12b). Clearly the use of only 2.1 equiv of CTAN at 25 °C is required when another oxidatively active functionality is present.
  • 36
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    • note
    • The anomalous removal of the sensitive dimethylacetal in conversion of 23 to 34 likely occurs during either workup or chromatographic purification rather than under the oxidative Prins cyclization conditions.


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