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Volumn 64, Issue 5, 1999, Pages 1715-1719

A synthesis of new coumarin C-glycosyl derivatives

Author keywords

[No Author keywords available]

Indexed keywords

COUMARIN DERIVATIVE; GLYCOSIDE;

EID: 0033525672     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo981868z     Document Type: Note
Times cited : (28)

References (81)
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    • note
    • f value of 7a than 4a; however, our attempts to isolate 7b in pure form were unsuccessful.
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    • note
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    • (c) Conformation A has less steric impedance of the substituents than B. In addition, the nucleophilic attack in A seeks the LUMO of the carbonyl, which is stabilized through the mixing of the π* C=O orbital with the lowest energy σ* orbital associated with the electronegative oxygen of the furanose; see: Houk, K. N.; Paddon-Row: M. N.; Rondan, N. G.; Wu, Y.-D.; Brown, F. K.; Spellmeyer, D. C.; Metz, J. T.; Li, Y.; Loncharich, R. J. Science 1986, 231, 1108-1117. We are thankful to one of the reviewers for his comments.
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    • note
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    • note
    • 1,2 ≈ 8.2 Hz).
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    • Lemieux, R. U.; Howard, J. Can. J. Chem. 1963, 41, 308-316. The characterization of structures 8-11 supported our earlier assignment for the carbinol 7a with the D-gluco configuration at C-5.
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    • note
    • 1H NMR data for all these compounds and in particular for 9β thus confirms the D-gluco configuration of 7a. The H-5 appeared as a doublet with a coupling constant of ∼9.7 Hz, indicating the axial-axial relation with H-4.
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    • note
    • 13C NMR spectra showed <5% signals corresponding to enol tautomer.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.