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portada New Strategies for N-Heterocyclic Carbenes Catalyzed Annulations (Springer Theses)
Type
Physical Book
Publisher
Author
Year
2018
Language
English
Pages
140
Format
Paperback
ISBN13
9789811097348
Categories

New Strategies for N-Heterocyclic Carbenes Catalyzed Annulations (Springer Theses)

Xiangyu Chen (Author) · Springer · Paperback

New Strategies for N-Heterocyclic Carbenes Catalyzed Annulations (Springer Theses) - Xiangyu Chen

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Synopsis "New Strategies for N-Heterocyclic Carbenes Catalyzed Annulations (Springer Theses) "

This thesis focuses on NHC-catalyzed annulation of nitroalkenes, enals and ,ss-unsaturated carboxylic acids. (1) NHCs were found to be efficient catalysts for the [4+2] annulation of ss-substituted nitroalkenes. The scope of Rauhut-Currier reaction was successfully extended to the most challenging ss-substituted alkenes by this method; (2) Enals were successfully used for [4+2] annulations with azodicarboxylates catalyzed by NHC via -addition. Highly enantiopure tetrahydropyridazinones and -amino acid derivatives could be easily prepared by subsequent transformations of the resulting dihydropyridazinones. (4) The readily available ,ss-unsaturated carboxylic acids were first successfully employed to generate the ,ss-unsaturated acyl azolium intermediates by using NHC for the enantioselective [3+2] and [3+3] annulations.

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