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Chemoselective intramolecular ring closure on the phenolic OH groups of p-tert-butylthiacalix[4]arene-1,3-bis(N-ω-hydroxyalkylamides) attained under Mitsunobu conditions affords inherently chiral macrocycles capped by carboxamide bridges. Oxazoline or oxazine cyclization products derived from self-condensation of the hydroxyalkylamide moieties were not isolated. In one case the detection of enantiomers...
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