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
WAHLBERG, I
中科院分区:
化学3区
文献类型:
--
作者:
OLSSON, E;BERG, JE;WAHLBERG, I

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从希腊烟草花的提取物中分离出八个新的西松烷类化合物。他们被认定为(1 S,2 E,4S,6 R,7 E,10 R,11 E)-2,7,11-柏木三烯-4,6,10-三醇(1),相应的(10 S)-、(4 R *)-和(4 R *,10 S *)-非对映异构体(2-4),(1 S *,2 E,4 R *,6 R *,7 E,10 S *,11 Z)-2,7,11-柏木三烯-4,6,10-三醇(5),(1 S,2 E,4S,6 R,7 E,11 E)-4,6-二羟基-2,7,11-柏木三烯-10-酮(6),相应的(4 R *)-差向异构体(7)和(1 S *,2 E,4S*,7 E,10 S *,11 E)-4,10-二羟基-2,7,11-柏木三烯-6-酮(8)的化学和光谱方法,2D-NMR技术特别有用。已经确定并描述了二乙酸酯11的晶体结构。用NMR方法结合分子力学计算(MM 3)研究了三元醇1和3的溶液构象。对新化合物的生物成因进行了讨论。
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.