New Strategies for N-Heterocyclic Carbenes Catalyzed Annulations di Xiangyu Chen edito da Springer
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New Strategies for N-Heterocyclic Carbenes Catalyzed Annulations

Editore:

Springer

EAN:

9789811028984

ISBN:

9811028982

Pagine:
123
Formato:
Hardback
Lingua:
Inglese
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Descrizione New Strategies for N-Heterocyclic Carbenes Catalyzed Annulations

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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