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Volumn 45, Issue 3, 2004, Pages 473-476

Preparation of chiral organochalcogeno-α-methylbenzyl alcohols via biocatalysis. The role of Daucus carota root

Author keywords

CAL B; Chiral alcohols; Daucus carota; Selenium; Sulfur

Indexed keywords

ACETOPHENONE DERIVATIVE; BENZYL ALCOHOL DERIVATIVE; CHALCOGEN; VEGETABLE PROTEIN;

EID: 0346363696     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tetlet.2003.11.011     Document Type: Article
Times cited : (67)

References (45)
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    • (2003) Acc. Chem. Res. , vol.36 , pp. 731
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    • 2-derivatives of tellurium with acetylenes mediated by Pd, see: Zeni G., Comasseto J.V. Tetrahedron Lett. 40:1999;4619. For a review, see: Zeni G., Braga A.L., Stefani H.A. Acc. Chem. Res. 36:2003;731. For similar reactions with vinylic selenides, see: Comasseto J.V., Ling L.W., Petragnani N., Stefani H.A. Synthesis. 1997;373.
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    • note
    • 10OSe: C, 50.72; H, 4.73.
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    • note
    • 12OSe: C, 50.24; H, 5.62.
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    • note
    • 3), ee=99%.
  • 38
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    • note
    • The (S)-3- and (S)-4-bromo-α-methylbenzyl alcohols were obtained by enzymatic kinetic resolution of the appropriate racemic mixture of meta- and para-bromo-α-methylbenzyl alcohols mediated by Novozym 435 (CAL-B) in tert-butyl methyl ether as the solvent and vinyl acetate as the acetyl donor. Further reaction of these chiral bromo precursors was carried out with t-BuLi followed by addition of the appropriate elemental chalcogen and methyl iodide or diphenyl diselenide to insert the organochalcogeno group. Andrade, L. H.; Omori, A. T.; Porto, A. L. M.; Comasseto, J. V., in press.
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    • (a) For examples, see: Córdova A., Janda K.D. J. Org. Chem. 66:2001;1906 (b) Zhang Y., Yuan C., Li Z. Tetrahedron. 58:2002;2973 (c) Xu D., Li Z., Ma S. Tetrahedron Lett. 44:2003;6343.
    • (2003) Tetrahedron Lett. , vol.44 , pp. 6343
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    • note
    • 3), ee=98%. The chiral standards (S)-4a , (S)-4d and (S)-4g were prepared from (S)-1-phenylethanol using ortho-lithiation method with n-BuLi and TMEDA followed by addition of the appropriate elemental chalcogen and methyl iodide or diphenyl diselenide to insert the organochalcogeno group. Andrade, L. H.; Omori, A. T.; Porto, A. L. M.; Comasseto, J. V.; Cunha, R. L. O. R. Unpublished results.
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    • note
    • 77Se NMR spectra for substituted esters prepared with 4d.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.