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Extra info for An Image Watermarking Scheme Based on Information Theoretic Principles
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Abstract Paraconic acids, belonging to the class of g-butyrolactone natural products, display a broad range of biological activities such as antibiotic and antitumor properties. Consequently a great number of synthetic strategies have been devised for them, ranging from diastereoselective and chiral pool approaches to the application of asymmetric catalysis. This review gives a critical account on the different methods developed that lead to paraconic acids of great structural variety.
They tested the bioactivities of the preussin isomers against cell growth of the fission yeast cdc25 mutant and found, that all stereoisomers were almost equally bioactive . 22 B. Basler et al. , an even shorter synthesis of preussin was reported by Overhand and Hecht . Up to date the Hecht synthesis has remained one of the most straightforward and concise routes to the target (Scheme 21). The synthesis did not include a nucleophilic attack on Scheme 21 phenylalaninal, but on the Weinreb amide of phenylalanine.