Synlett 2012; 23(9): 1271-1282
DOI: 10.1055/s-0031-1290486
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© Georg Thieme Verlag Stuttgart · New York

Alkynedicobalt Complexes in γ-Carbonyl Cations and Cycloheptynedicobalt Complexes

James R. Green*
Department of Chemistry and Biochemistry, University of Windsor, Windsor, ON, N9B 3P4, Canada, Fax: +1(519)9737098   eMail: jgreen@uwindsor.ca
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Publikationsverlauf

Received: 29. November 2011

Accepted after revision: 04. Januar 2012

Publikationsdatum:
29. März 2012 (online)


Abstract

This Account describes our work on highly electrophilic γ-carbonyl cations featuring propargyldicobalt cations, cycloheptynedicobalt complexes, and the interconnection between the two systems.

1 Introduction

2 γ-Carbonyl Cations via Iron Allyl Cations

3 γ-Carbonyl Cations via Propargyldicobalt Cations

3.1 Synthesis of Velloziolide

3.2 Synthesis of Microstegiol

4 Synthesis of Cycloheptynedicobalt Complexes

4.1 Synthesis via γ-Carbonyl Cations

4.2 Cycloheptynedicobalt Complexes via [4+3] Cycloaddition Reactions

4.3 Cycloheptynedicobalt Complexes via Ring-Closing Meta­thesis

4.4 Cycloaddition Reactions on Cycloheptynedicobalt Complexes

4.5 Cycloheptynedicobalt Complexes via Intramolecular ­Nicholas Reactions

5 Dehydrotropylium Ion Co2(CO)6 Complex

6 Final Comments