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Conformational analysis of c3′‐c8 connected biflavones
Author(s) -
Konda Yaeko,
Sasaki Tomomitsu,
Kagawa Hitoshi,
Takayanagi Hiroaki,
Harigaya Yoshihiro,
Sun XueLong,
Li Xian,
Onda Masayuki
Publication year - 1995
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570320521
Subject(s) - chemistry , stereochemistry , two dimensional nuclear magnetic resonance spectroscopy , crystallography
Two biflavones isolated from Taxus cuspidata were identified with ginkgetin (1) and sciadopitysin (2) which belong to C3′‐C8 connected biflavones. The conformation of 2 in the solid state was determined by X‐ray analysis and the conformations of 1 and 2 in the liquid state were discussed using nmr techniques. Complete assignments of 1 H and 13 C nmr spectra about 1 were made on the basis of COSY, HMQC, HMBC and nOe experiments.