Reaction of 2-methylene-1,3-dicarbonyl compounds containing a CF3-group with 1,3-dienesстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The Knoevenagel condensation of 1-substituted 4,4,4-trifluorobutan-1,3-diones with paraformaldehyde in the presence of cyclic and Linear 1,3-dienes leads to Diels-Alder cycloadducts via in situ formation of the appropriate 2-methylene-1,3-dicarbonyl compounds 2(a-c). In the reactions with linear 1,3-dienes, compounds 2(a-c) react as dienophiles. In the case of the reactions with cyclic 1,3-dienes both normal and inverse demand Diels-Alder reactions take place. (C) 2000 Elsevier Science Ltd. All rights reserved.