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Volumn , Issue 14, 2006, Pages 2176-2182

Inversion of diastereoselectivity depending on substrate concentration in baker's yeast catalyzed reduction of σ-symmetrical 1,3-cyclopentadiones and 1,3-cyclohexadiones

Author keywords

symmetrical cyclopentane 1,3 dione; Baker's yeast catalyzed asymmetric reduction; Substrate concentration

Indexed keywords

1,3 CYCLOHEXADIONE DERIVATIVE; 1,3 CYCLOPENTADIONE DERIVATIVE; ACETYLACETONE; UNCLASSIFIED DRUG;

EID: 33748707989     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2006-949647     Document Type: Article
Times cited : (15)

References (28)
  • 1
    • 0000251275 scopus 로고
    • Enzymes in synthetic organic chemistry
    • Baldwin, J. E.; Magnus, P. D., Eds.; Pergamon Press: Oxford
    • See, for example: Wong, C.-H.; Whitesides, G. M. Enzymes in Synthetic Organic Chemistry, In Tetrahedron Organic Chemistry Series, Vol. 12; Baldwin, J. E.; Magnus, P. D., Eds.; Pergamon Press: Oxford, 1994.
    • (1994) Tetrahedron Organic Chemistry Series , vol.12
    • Wong, C.-H.1    Whitesides, G.M.2
  • 20
    • 33748697962 scopus 로고    scopus 로고
    • note
    • (b) Not only baker's yeast but also Saccharomyces cerevisiae (brewing yeast), Bacillus thuringiensis afforded excellent results:
  • 23
    • 33748676568 scopus 로고    scopus 로고
    • note
    • 3): δ = 18.7, 18.9, 27.2, 29.2, 33.1, 34.0, 51.9, 53.8, 76.8, 175.1, 221.3.
  • 24
    • 33748705863 scopus 로고    scopus 로고
    • note
    • In order to obtain high reproducibility in the reaction with 8 mM substrate, newly opened baker's yeast must be used. If long-term-stored yeast (longer than ca. 6 months at 4 °C) is used in the reaction, a reduced de is observed. The reproduced results were obtained with baker's yeast (Sigma, type II, lot. No. 125K0062).
  • 25
    • 33748696114 scopus 로고    scopus 로고
    • note
    • 3): δ = 19.2, 26.7, 28.2, 28.4, 33.9, 51.4, 52.7, 77.3, 121.0, 149.2, 167.1, 220.0.
  • 26
    • 33748690677 scopus 로고    scopus 로고
    • note
    • Chiral HPLC analysis of 9b was performed with a Shimadzu LC-10A Liquid Chromatograph series using a SHISEIDO Ceramospher Chiral RU-1 (0.46 φ × 250 mm). Two enantiomers of 9b were detected at the retention time of 10.7 and 11.7 min by eluting with MeOH, flow rate: 0.5 mL/min, at 50 ×C. The enantiomer predominantly obtained in the reaction (entry 1, Table 1) appeared at 11.7 min. Meanwhile, two enantiomers of 9a were detected using Daicel CHIRALCEL OJ-H (0.46 φ × 250 mm) at 43.2 and 47.5 min by eluting with a mixed solvent of n-hexane and 2-PrOH (9:1), flow rate: 0.5 mL/min, at 25 °C. The predominant enantiomer in the reaction (entry 2, Table 1) was detected at 47.5 min.
  • 27
    • 33748697961 scopus 로고    scopus 로고
    • note
    • Chiral HPLC analyses of 13b and 14b were performed with Daicel CHIRALCEL OD-H (n-hexane-i-PrOH = 96:4).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.