Volume 128, Issue 37 pp. 11290-11294
Zuschrift

Benzofulvenes in Trienamine Catalysis: Stereoselective Spiroindene Synthesis

Bjarke S. Donslund

Bjarke S. Donslund

Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark

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Rune Pagh Nielsen

Rune Pagh Nielsen

Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark

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Sofie M. N. Mønsted

Sofie M. N. Mønsted

Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark

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Prof. Karl Anker Jørgensen

Corresponding Author

Prof. Karl Anker Jørgensen

Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark

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First published: 06 July 2016
Citations: 10

Abstract

The asymmetric formation of spiroindenes containing up to four contiguous stereocenters from the reaction of benzofulvenes with 2,4-dienals through trienamine catalysis is described. The benzofulvene core was found to be an excellent starting point for the synthesis of interesting spiroindenes through a formal cycloaddition pathway. The reaction was mediated by a diphenylprolinol silyl ether catalyst, and a diverse array of spiroindenes were obtained in high yields with excellent stereoselectivity. An attractive feature of the developed system is the possibility to diversify the product scaffold significantly by further manipulation of the chiral spiroindenes. Thus, three intramolecular ring-closing reactions following the organocatalytic step resulted in highly complex polycyclic systems.

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