Li C, Wurst K, Kräutler B. A Dipyrrin Programmed for Covalent Loading with Fullerenes.
Chemistry 2018;
24:10032-10037. [PMID:
29802661 PMCID:
PMC6099335 DOI:
10.1002/chem.201801995]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Indexed: 01/24/2023]
Abstract
We describe here a di-(β,β'-sulfoleno)pyrrin programmed for efficient and specific β,β'-functionalization via [4+2] cycloaddition reactions. At 120 °C and in the presence of an excess of C60 -fullerene the di-(β,β'-sulfoleno)pyrrin decomposed cleanly, furnishing a di-(β,β'-fullereno)pyrrin and the corresponding monofullereno-dipyrrin in an overall yield of 96 %. Hence, relatively mild thermolysis of the di-(β,β'-sulfoleno)pyrrin induced stepwise extrusion of two equivalents of SO2 , producing highly reactive dipyrrin-β,β'-diene intermediates readily, providing a very effective path to [4+2]-cycloadducts. As presented here by the example of the covalent attachment of C60 -fullerene units, a convenient general methodology for the efficient synthesis of covalent dipyrrin β,β'-cycloadducts is made available.
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