A New Synthesis of Fused Oxa- and Thiacrown Ethers-Thiophene/Furan Oligomers

[摘要]：We have developed a two-step sequence for preparing a series of macrocyclic oxa- and thiacrown ethers affixed to a thiophene/furan oligomer. The sequence involves the intramolecular Mn-III-promoted cyclization of linear diester precursors into 2,3-dihydrofurans, whose dehydrogenation furnishes the title compounds. A preliminary NMR study has shown that one of them seems to specifically chelate Pb2+

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