8 NEW CEMBRANOIDS FROM TOBACCO - STRUCTURAL ELUCIDATION AND CONFORMATIONAL STUDIES
8 NEW CEMBRANOIDS FROM TOBACCO - STRUCTURAL ELUCIDATION AND CONFORMATIONAL STUDIES
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DOI:
10.1016/s0040-4020(01)80414-2
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发表时间:
1993-05-28
期刊:
影响因子:
2.1
通讯作者:
WAHLBERG, I
中科院分区:
文献类型:
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作者:
OLSSON, E;BERG, JE;WAHLBERG, I
Eight new cembranoids have been isolated from an extract of flowers of Greek tobacco. They have been identified as (1S,2E,4S,6R,7E,10R,11E)-2,7,11-cembratriene-4,6,10-triol (1), the corresponding (10S)-, (4R*)- and (4R*,10S*)-diastereomers (2-4), (1S*,2E,4R*,6R*,7E,10S*,11Z)-2,7,11-cembratriene-4,6,10-triol (5), (1S,2E,4S,6R,7E,11E)-4,6-dihydroxy-2,7,11-cembratrien-10-one (6), the corresponding (4R*)-epimer (7) and (1S*,2E,4S*,7E,10S*,11E)-4,10-dihydroxy-2,7,11-cembratrien-6-one (8) with the aid of chemical and spectral methods, 2D-NMR techniques being particularly helpful. The crystal structure of the diacetate 11 has been determined and is described. The solution conformations of triols 1 and 3 have been studied by using NMR methods in conjunction with molecular mechanics calculations (MM3). The biogenesis of the new compounds is discussed.