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DOI: 10.1055/s-0028-1083633
Synthesis of Multilayered [3.3](3,5)Pyridinophanes [¹]
Publication History
Publication Date:
06 November 2008 (online)

Abstract
Two- to four-layered [3.3](3,5)pyridinophanes (PyPs) have been synthesized by the (4-tolylsulfonyl)methyl isocyanide (TosMIC) method. The coupling reaction between 3,5-bis[2-isocyano-2-(4-tolylsulfonyl)ethyl]pyridine (TosMIC adduct) and bis(chloromethyl) or tetrakis(bromomethyl) compounds in the presence of sodium hydride in N,N-dimethylformamide or sodium hydroxide and tetrabutylammonium iodide under high-dilution conditions gave the two-layered dione or three- and four-layered tetraones. Wolff-Kishner reduction of the ketones afforded the desired two- to four-layered [3.3](3,5)PyPs. The structure of the dione units take an anti geometry whereas the cyclophane units take a syn geometry in solution.
Key words
cyclophanes - pyridines - coupling reaction - ketones - Wolff-Kishner reduction
Multilayered [3.3]Cyclophanes, Part 4. For parts 1, 2, and 3, see refs. 12, 13a and 13b.
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Multilayered [3.3]Cyclophanes, Part 4. For parts 1, 2, and 3, see refs. 12, 13a and 13b.
10Satou, T.; Sabae, M.; Iizuka, S.; Akita, M.; Shinmyozu, T. unpublished results.