The first enantioselective synthesis of optically pure (R)- and (S)- 5,5''-dihydroxy-4',4''',7,7''-tetramethoxy-8,8''- biflavone and the reconfirmation of their absolute configuration

Tetrahedron Letters

Volumn 38, Issue 6, 1997, Pages 1087-1090

  Lin, Guo Qiang ^a   Zhong, Min ^a  

^a SHANGHAI INSTITUTE OF ORGANIC CHEMISTRY   (China)

Author keywords

[No Author keywords available]

Indexed keywords

BIFLAVONOID;

ARTICLE; CIRCULAR DICHROISM; DRUG PURITY; DRUG STRUCTURE; DRUG SYNTHESIS; ENANTIOMER; IN VITRO STUDY; REACTION ANALYSIS;

EID: 0031562041     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4039(96)02475-6     Document Type: Article

References (21)

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17. 2: C, 49.41; H, 4.39. Found: C, 49.33; H, 4.49.
18. +): 572.2411, found 572.2460.
19. 3).
20. ext 297 nm (Δε +3.38), 275 (Δε -2.03), 240 (Δε +3.78), 235 (Δε +2.43), 230 (Δε +3.78), 211 (Δε -6.21).
21. ext 359 nm (Δε -23.2), 323 (Δε +54.8), 264 (Δε -15.2).