메뉴 건너뛰기




Volumn 4, Issue 6, 2000, Pages 488-497

A practical synthesis of an anti-methicillin resistant Staphylococcus aureus cephalosporin BMS-247243

(35)  Singh, Janak a   Kim, Oak K g   Kissick, Thomas P a   Natalie, Kenneth J b   Zhang, Bo a   Crispino, Gerard A d   Springer, Dane M g   Wichtowski, John A g   Zhang, Yunhui g   Goodrich, Jason g   Ueda, Yasutsugu g   Luh, Bing Y g   Burke, Brian D a   Brown, Matthew b   Dutka, Anthony P b   Zheng, Bin b   Hsieh, Dau Ming b   Humora, Michael J b   North, Jeffrey T a   Pullockaran, Anne J a   more..


Author keywords

[No Author keywords available]

Indexed keywords


EID: 0034311325     PISSN: 10836160     EISSN: None     Source Type: Journal    
DOI: 10.1021/op0002850     Document Type: Article
Times cited : (16)

References (37)
  • 20
    • 0002356854 scopus 로고    scopus 로고
    • note
    • ACLH·HCl was purchased from Otsuka Chemical Company, Japan.
  • 21
    • 0002073260 scopus 로고    scopus 로고
    • note
    • HPLC method: Wavelength 260 nm; solvent A: 0.2% aqueous phosphoric acid; solvent B: 90% acetonitrile/10% water; flow rate 1.5 ml/min. (a) Column: YMC S3 ODS-A 6.0 × 150 mm; start B = 0%, final B = 100%, gradient time = 20 min, hold time 10 min. (b) Column: YMC S3 Ph 6.0 × 150 mm; start B = 30%, final B = 55%, gradient time = 60 min. (c) same as method (a) but with gradient time = 30 min.
  • 27
    • 0002161268 scopus 로고    scopus 로고
    • note
    • Diacid 19 could not be analyzed by HPLC due to its instability. It was unstable also in DMSO, and therefore NMR spectra were taken in deuterated THF or DMF.
  • 28
    • 0002056765 scopus 로고    scopus 로고
    • note
    • Possible paths for the degradation of cephem diacid 19 to the diacid 20 are outlined below. (formula presented) 20: degradation product
  • 29
    • 0002191005 scopus 로고    scopus 로고
    • note
    • The structure of the diacid 20 was confirmed by the following synthesis. Acylation of tert-butylgiycine with monoacid ester 12b formed diester (i) which on double deprotection gave diacid 20. (formula presented)
  • 31
    • 0002310895 scopus 로고    scopus 로고
    • note
    • Diphenylmethyl ester hydrolyzed selectively on heating diester 21 in water at 80 °C. After 10 min the ratio of the mono-tert-butyl ester 21 to the diester 25 was 2.6:1.
  • 32
    • 0002335774 scopus 로고    scopus 로고
    • note
    • A minor amount (<0.1%) of the byproduct disulfide (i) was isolated by column chromatography of one of the partially deprotected batches to prepare a reference sample of monoester 25. The structure is based on NMR spectra and MS/MS analysis (Dr. Haiying Zhang, AR & D, Princeton).
  • 34
    • 0002186303 scopus 로고    scopus 로고
    • note
    • (a) Use of the Advancec Photon Source was supported by the U.S. Department of Energy, Basic Energy Sciences, Office of Science, under Contract No. W-31-109-Kng-38. (b) Crystallographic data (excluding structure factors) for the structure in this paper have been deposited with the Cambridge Cristallographic Data Centre. Copies of the data can be obtained, free of charge, on application to CCDC, 12 Union Road, CambridgeCB21EZ,UK(fax: +441223336033 ore-mail: deposit@ccdc.cam.ac.uk). (c) Data were collected at beamline 17-ID in the facilities of the Industrial Macromolecular Crystallography Association Collaborative Access Team (IMCA-CAT) at the Advanced Photon Source. These facilities are supported by the companies of the Industrial Macromolecular Crystallography
  • 35
    • 0002071836 scopus 로고    scopus 로고
    • note
    • R 14 9.2 min, 12a 6.2 min, 12b 3.7 min, DMF 2.0 min.
  • 36
    • 0002051899 scopus 로고    scopus 로고
    • note
    • This reaction required 2 days at room temperature.
  • 37
    • 85086806932 scopus 로고    scopus 로고
    • note
    • f 4 0.74, 5 0.14. (c) EtOAc:heptane = 1:4, visualized by UV.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.