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sahai mahendra; gössinger edda; luzhetska marta; härle johannes; begum sajeli a.; ray anil b.; kinghorn a. douglas (curatore); falk heinz (curatore); kobayashi junichi (curatore) - fortschritte der chemie organischer naturstoffe / progress in the chemistry of organic natural products, vol. 93

Fortschritte der Chemie organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products, Vol. 93

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Lingua: Inglese
Pubblicazione: 06/2010
Edizione: 2010


Lignans, by convention, are a group of natural products that are formed by linking two phenylpropanoid units (C C units) by oxidative coupling. Most importantly, in 6 3 a lignan, two (C C units) are bound through the central carbon of their side chains, 6 3 0 i. e. the 8 and 8 positions (1, 2). The occurrence of C C -dimers, linked at sites other 6 3 0 than the 8–8 positions, is also known and these compounds have been termed neolignans (3, 4). As these two groups of compounds have close structural as well as biosynthetic relationships, they are often associated together and incorporated under the general term “lignan” (5). The diverse structural categorization of true lignans and of a few neolignans is presented in Fig. 1. Through the years, several review articles or books covering different facets of lignans, including their ch- istry (6, 7), biogenesis (8), synthesis (9), and biological activities (10) have been published. Enduring research for the investigation of secondary metabolites of plants has evidenced some compounds that are biogenetically related to true lignans or neolignans but bear some features not discerned in conventional lignans. These compounds or groups of compounds have been termed as “non-conventional lignans”, and include coumarinolignans, ?avonolignans, and stilbenolignans. The non-conventional lignans, like the conventional ones, have two C C units linked 6 3 together but have additional structural features to place them also under the category of coumarins, ?avonoids, or stilbenes.


List of Contributors

Nonconventional Lignans: Coumarinolignans, Flavonolignans, and Stilbenolignans

by Sajeli A. Begum, Mahendra Sahai, and Anil B. Ray

1. Introduction

2. Coumarinolignans

3. Flavonolignans

4. Stilbenolignans



by Edda Gössinger

1. Introduction

2. Tabular Overview of the Picrotoxanes

3. Occurrence

4. Isolation of Picrotoxanes

5. Structure Determination of Picrotoxanes

6. Total Syntheses of Picrotoxanes

7. Biosynthesis of Picrotoxanes

8. Physiological Activity of Picrotoxanes



Combinatorial and Synthetic Biosynthesis in Actinomycetes

by Marta Luzhetska, Johannes Härle, and Andreas Bechthold

1. Introduction

2. Combinatorial Biosynthesis and Synthetic Biosynthesis


Author Index

Subject Index

Altre Informazioni



Condizione: Nuovo
Collana: Fortschritte der Chemie organischer Naturstoffe Progress in the Chemistry of Organic Natural Products
Dimensioni: 235 x 155 mm Ø 594 gr
Formato: Copertina rigida
Illustration Notes:XVI, 264 p. 40 illus., 7 illus. in color.
Pagine Arabe: 264
Pagine Romane: xvi

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