Dienamine Catalysis for Organic Synthesis
CHAPTER 4: Ramachary’s Dienamines (Push–Pull Dienamines): In situ Generation and Applications
Published:02 Mar 2018
Special Collection: 2018 ebook collectionSeries: Catalysis Series
Kengadarane Anebouselvy, Dhevalapally B. Ramachary, 2018. "Ramachary’s Dienamines (Push–Pull Dienamines): In situ Generation and Applications", Dienamine Catalysis for Organic Synthesis, Kengadarane Anebouselvy, Dhevalapally B Ramachary, Indresh Kumar
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Ramachary’s push–pull dienamines, prepared in situ from Hagemann’s esters, have participated efficiently in many cascade sequences, such as the Claisen–Schmidt condensation, enamine amination/isoaromatization (EA/IA), Claisen–Schmidt/isomerization, Claisen–Schmidt/Michael reactions, Claisen–Schmidt/Henry (CS/H) reactions and multi-catalysis cascade reactions. The synthesis of highly functionalized phenols, o-pyrrolidine-1-yldiarylamines, o-hydroxydiarylamines, (Z)-2-(buta-1,3-dienyl)phenols, 2-methyl-2H-chromenes, (E)-1,3-dienes, dienones, chromenone, benzoxazocines and terpenoid-type chiral decalines was accomplished through push–pull dienamine intermediates. Further, these were applied in the synthesis of medicinally important nefopam analogues. Highly functionalized NH-1,2,3-triazoles and 1,4,5-trisubstituted-1,2,3-triazoles were also accessed via [3+2]-cycloaddition. In addition, upon Michael addition with β-nitrostyrenes, push–pull dienamines produced Baylis–Hillman-type products.