[reaction: see text] A novel method for the synthesis of new highly functionalized cyclotrimers is described. The method consists of an original synthesis of beta-dibromosubstituted pyrroles, metalation, cycloaddition, and cyclotrimerization. The sequence is highly compatible with common functional groups and allows the construction of cup-shaped molecules functionalized both at the upper and bottom rim. This feature makes the newly formed structures useful scaffolds for the development of supramolecular receptors.
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Zonta et al. (2005) studied this question.
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