Volume 55, Issue 14 pp. 4605-4609
Communication

Photooxygenation of Furylalkylamines: Easy Access to Pyrrolizidine and Indolizidine Scaffolds

Dr. Dimitris Kalaitzakis

Dr. Dimitris Kalaitzakis

Department of Chemistry, University of Crete, Vasilika Vouton, 71003 Iraklion, Crete, Greece

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Myron Triantafyllakis

Myron Triantafyllakis

Department of Chemistry, University of Crete, Vasilika Vouton, 71003 Iraklion, Crete, Greece

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Manolis Sofiadis

Manolis Sofiadis

Department of Chemistry, University of Crete, Vasilika Vouton, 71003 Iraklion, Crete, Greece

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Dr. Dimitris Noutsias

Dr. Dimitris Noutsias

Department of Chemistry, University of Crete, Vasilika Vouton, 71003 Iraklion, Crete, Greece

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Prof. Dr. Georgios Vassilikogiannakis

Corresponding Author

Prof. Dr. Georgios Vassilikogiannakis

Department of Chemistry, University of Crete, Vasilika Vouton, 71003 Iraklion, Crete, Greece

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First published: 02 March 2016
Citations: 57

Graphical Abstract

Singlet oxygen is able to transform unprotected primary furylalkylamines into the important pyrrolizidine and indolizidine scaffolds. The outcome of the one-pot sequences can be readily tailored to need by varying the choice of sensitizer. The synthetic utility of this method was demonstrated in the rapid synthesis of five natural products. PS: Photosensitizer. RB: rose Bengal. MB: Methylene blue.

Abstract

A highly adaptable method targeting the ubiquitous and very important pyrrolizidine and indolizidine scaffolds is presented. The general synthetic utility of the method is underscored by its application to the rapid and easy synthesis of five natural products starting from readily accessible alkylfuran precursors. These unprotected primary furylalkylamines are subjected to photooxygenation conditions, which initiate a complex cascade reaction sequence concluding with the production of high value motifs. This sequence can be tailored to need by varying the choice of both photosensitizer and base additive.

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