Styrol glycosides

Styrol Glycosides, Dihydrostilbenes, Lignans, Quinones and Naphthalenes 

Lunularic acid (100), a natural dihydrostilbene growth inhibitor found in liverworts 74) and also in algae (75), has not yet been detected in ferns. A related compound notholaenic acid (101) occurs as a frond exudate component of two gymnogrammoid ferns 76) and is reported to have photosynthesis inhibiting activity on chloroplast (77) and also antimicrobial activity 78). Ternatin (102), in which a benzene ring is linked to a monoterpene unit to form a chromene ring, has been isolated from Sceptridium ternatum 79) and S.japonicum 80). 

Proliferic acid (105) and its stereoisomers (106, 107) from several species of the Blechnaceae, were the first A -7,0,3, 8,2 -lignans (83) to be reported (68). Lignans with no methoxy or methylendioxy groups are rather unusual and it is noteworthy that these lignans 105, 106 and 107 have free carboxyl groups. In brainic acid (108), isolated from Brainea insignis one of the carboxyl groups is esterified with shikimic acid (834) (68). 

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Table 4. Styrol Glycosides, Dihydrostilbenes, Lignans, Quinones and Naphthalenes Found in the Filicopsida... 

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