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The synthesis of novel 27- and 30-membered macrocycles of the trianglimine and trianglamine type is described, based on a [3+3] cyclocondensation between an enantiomerically pure 1,2-diamine and aromatic dicarboxaldehydes.
Direct dithioketalisation of N,N-dialkylhydrazones promoted by BF 3 .E 2 O or p-TsOH and 1,2-ethanedithiol in dry medium affords the corresponding dithiolanes in nearly quantitative yields. A variety of hydrazones derived from several kinds of aldehydes (aliphatic, aromatic, and α,β-unsaturated) and hydrazines [N,N-dimethylhydrazine, 1-aminopyrrolidine, and (S)-1-amino-2-(methoxymethyl)pyrrolidine...
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