α,ω-Diamino aliphatic ethers react under ambient conditions with dimethyl α,ω-dicarboxylates, in methanol as a solvent, to give the cyclic diamides in good yields, and their subsequent reduction with lithium aluminium hydride affords the respective diazacoronands.
J. Jurczak, S. Kasprzyk, P. Sałański and T. Stankiewicz, J. Chem. Soc., Chem. Commun., 1991, 956 DOI: 10.1039/C39910000956
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