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The syntheses, characterization, and inclusion properties of two new trinuclear boron compounds having a calixlike shape are described. Macrocyclic compounds were obtained vía self‐assembly reactions between salicylaldehyde carboxyl derivatives and 3‐aminophenylboronic acid, whereby the formation of three N–B coordination bonds favored the oligomerization process. The products are stable to moisture and have good solubility in organic solvents. The inclusion properties toward primary amines and pyrophosphate were analyzed by titration experiments and monitored by UV‐vis spectroscopy. Association constants around 103‐105 M−1 were determined for both compounds.

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