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Volumn 44, Issue 27, 2003, Pages 5057-5059

A new approach to β-amino acids: Biotransformation of N-protected β-amino nitriles

Author keywords

Aziridines; Biotransformation; Nitrile hydratase; amino acids; amino nitriles

Indexed keywords

BETA AMINO ACID;

EID: 0037842784     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4039(03)01136-5     Document Type: Article
Times cited : (39)

References (40)
  • 24
    • 85031175531 scopus 로고    scopus 로고
    • For a typical experiment, cells of Rhodococcus sp. R312 and Rhodococcus erythropolis NCIMB 11540 were freshly cultivated and harvested by centrifugation. After a washing step, the cells were resuspended in phosphate buffer. To 500 μL of resting cell suspension in Eppendorff vessels, 25 μL of the substrates were added as 5% solutions in DMSO. The bioconversions proceeded at 130 rpm and 30°C in a rotary shaker and were stopped after 24 h by addition of HCl (2N). Remaining starting material and products were extracted with ethylacetate and the conversion rates were determined by reversed-phase HPLC
    • For a typical experiment, cells of Rhodococcus sp. R312 and Rhodococcus erythropolis NCIMB 11540 were freshly cultivated and harvested by centrifugation. After a washing step, the cells were resuspended in phosphate buffer. To 500 μL of resting cell suspension in Eppendorff vessels, 25 μL of the substrates were added as 5% solutions in DMSO. The bioconversions proceeded at 130 rpm and 30°C in a rotary shaker and were stopped after 24 h by addition of HCl (2N). Remaining starting material and products were extracted with ethylacetate and the conversion rates were determined by reversed-phase HPLC.
  • 25
  • 26
    • 85031173930 scopus 로고    scopus 로고
    • 13C NMR δ 21.39, 39.27, 41.47, 53.70, 127.08, 127.71, 129.09, 130.26, 130.32, 139.02, 139.90, 143.55, 173.42
    • 13C NMR δ 21.39, 39.27, 41.47, 53.70, 127.08, 127.71, 129.09, 130.26, 130.32, 139.02, 139.90, 143.55, 173.42.
  • 27
    • 85031168822 scopus 로고    scopus 로고
    • 13C NMR δ 21.79, 23.20, 28.54, 33.66, 50.90, 57.73, 127.52, 129.98, 137.18, 143.90, 179.88
    • 13C NMR δ 21.79, 23.20, 28.54, 33.66, 50.90, 57.73, 127.52, 129.98, 137.18, 143.90, 179.88.
  • 28
    • 85031166317 scopus 로고    scopus 로고
    • 13C NMR δ 21.52, 24.80, 29.76, 33.19, 50.41, 53.95, 126.97, 129.95, 140.98, 142.63, 175.53
    • 13C NMR δ 21.52, 24.80, 29.76, 33.19, 50.41, 53.95, 126.97, 129.95, 140.98, 142.63, 175.53.
  • 35
    • 85031170384 scopus 로고    scopus 로고
    • Whereas for screening experiments the use of a cosolvent was crucial, its influence on the large scale biotransformation turned out to be less important
    • Whereas for screening experiments the use of a cosolvent was crucial, its influence on the large scale biotransformation turned out to be less important.
  • 38
    • 85031177286 scopus 로고    scopus 로고
    • 4 and the solvent was removed under reduced pressure. Unreacted nitrile, product amide and acid were purified by chromatography and recrystallization
    • 4 and the solvent was removed under reduced pressure. Unreacted nitrile, product amide and acid were purified by chromatography and recrystallization.
  • 39
    • 85031168660 scopus 로고    scopus 로고
    • HHPLC analysis of the crude isolates gave for R. sp. R312: 48% 3a, 13%, 3b, 39%, 3c and 47% 4a, 45% 4b, 8% 4c; for R. erythropolis NCIMB 11540: 64% 3a, 5% 3b, 31% 3c and 74% 4a, 21% 4b, 5% 4c
    • HHPLC analysis of the crude isolates gave for R. sp. R312: 48% 3a, 13% 3b, 39% 3c and 47% 4a, 45% 4b, 8% 4c; for R. erythropolis NCIMB 11540: 64% 3a, 5% 3b, 31% 3c and 74% 4a, 21% 4b, 5% 4c.
  • 40
    • 85031163754 scopus 로고    scopus 로고
    • 27% e.e. for R. sp. R312 and 39% e.e. for R. erythropolis NCIMB 11540, obtained from HPLC analysis using a Chirobiotic R® column (MeOH/TEA/AcOH 100:0.4:0.1)
    • 27% e.e. for R. sp. R312 and 39% e.e. for R. erythropolis NCIMB 11540, obtained from HPLC analysis using a Chirobiotic R® column (MeOH/TEA/AcOH 100:0.4:0.1).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.