Abstract:The Dieckmann condensation has been used for the first time for the syntheses of novel 1,2,4-triazolophanes and 1,3,4-oxadiazolophanes. The bis-1,3,4-oxadiazol-2-thiols 1a and 1b were reacted with ethyl bromoacetate to give the diesters 2a and 2b. Diesters 2a and 2b were treated under dry conditions with sodium methoxide in methanol to afford desired symmetrical 1,3,4-oxadiazolophanes 3a and 3b. Similarly, diesters of macrocycle precursors containing 1,2,4-triazole moiety, that is, 6a, 6b, 10, 13a, 13b, and 13… Show more
Symmetrical diesters containing triazole and oxadiazole units are subjected to Diekmann condensation to prepare title triazolophanes, e.g. (IV) and (VII), and oxadiazolophanes, e.g. (VI).
Symmetrical diesters containing triazole and oxadiazole units are subjected to Diekmann condensation to prepare title triazolophanes, e.g. (IV) and (VII), and oxadiazolophanes, e.g. (VI).
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