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Volumn , Issue 23, 2006, Pages 5367-5377

An improved synthesis of procyanidin dimers: Regio- and stereocontrol of the interflavan bond

Author keywords

Oligomerization; Polyphenol; Procyanidin dimer; Stereoselectivity; Synthetic methods

Indexed keywords


EID: 33845461934     PISSN: 1434193X     EISSN: 10990690     Source Type: Journal    
DOI: 10.1002/ejoc.200600668     Document Type: Article
Times cited : (78)

References (49)
  • 35
    • 33845438291 scopus 로고    scopus 로고
    • note
    • H3H4 coupling constant (2.6 Hz) of the epicatechin derivative 3b does not allow any conclusion concerning the stereochemistry of C4 to be drawn. However, the selective pulse of the H4 proton gave a NOE correlation with H3, but no correlation with H2, while the selective pulse of H3 gave correlations with both H2 and H4 suggesting that H3 would preferably be in an equatorial conformation and that the H4 and H2 protons would be on the opposite side of the C ring, in accordance with an RRS stereochemistry for 3b. Moreover the comparison through molecular modelling (MM3* force field, Monte Carlo style conformational search) of the interproton distances between H2,H3 and H3,H4 with the NOE correlation peak intensity measured for these protons confirmed the S configuration of C4.
  • 39
    • 33845433103 scopus 로고    scopus 로고
    • Ph. D. Thesis, Bordeaux 1 University, (unpublished results)
    • K. Barathieu, Ph. D. Thesis, Bordeaux 1 University, 2002, pp. 77-80 (unpublished results).
    • (2002) , pp. 77-80
    • Barathieu, K.1
  • 40
    • 33845406009 scopus 로고    scopus 로고
    • note
    • The ratios observed in chloroform for each pair of retomers 9a-d are: 77:23 for B1, 67:33 for B2, 63:37 for B3 and 85:15 for B4.
  • 49
    • 33845395678 scopus 로고    scopus 로고
    • note
    • NMR spectra for 10d were recorded at 5°C in order to avoid the coalescence phenomena observed at 22°C due to the specific rate of rotational isomerization of 10d.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.