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Asymmetric Aldol Reactions. Synthesis of Paraconic Acids & Lignans
В наличии
Местонахождение: Алматы | Состояние экземпляра: новый |
Бумажная
версия
версия
Автор: Aswini Kumar Giri and Saumen Hajra
ISBN: 9783639713312
Год издания: 2014
Формат книги: 60×90/16 (145×215 мм)
Количество страниц: 244
Издательство: Scholars' Press
Цена: 53944 тг
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Аннотация: Chiral auxiliary based and organocatalyzed aldol reactions have been used for the asymmetric synthesis of various natural products. These reactions steps have been used in synthesizing ?-butyrolactone containing natural products and their analogs. An asymmetric route for one-pot synthesis of trans- and cis-4,5-disubstituted-?-butyrolactones via reagent sequence controlled syn- and anti- aldol reactions of N-succinyl-2-oxazolidinone are described. Mechanistic studies are discussed. Using these asymmetric syn- and anti-aldol reactions of chiral N-succinyl-2-oxazolidinones, trans-paraconic acids and cis-paraconic acids are synthesized in both of their enantiomeric forms. Enantioselective one-pot synthesis of ?-(hydroxyalkyl)-?-butyrolactones employing cross-aldol reaction catalyzed by an organocatalyst is described. Efficient routes for the asymmetric synthesis of (–)-enterolactone, natural hydroxyenterolactone and its analog utilizing organocatalytic asymmetric cross-aldol reaction and C-alkylation as the key steps are achieved. Similar routes have provided chiral intermediates, which could be converted to epi-isohydroxymatairesinol and (7?R)-7?-hydroxymatairesinol.
Ключевые слова: Natural Products, Organic, Total Synthesis, asymmetric, Aldol, chiral auxiliary, alkylation, organocatalyst, paraconic acids, methylenolactocin, protolichesterinic acid, roccellaric acid, nephrosteranic acid, phaseolinic acid, Lignans, hydroxyarctigenin, enterolactone, hydroxyenterolactone