New heterocyclic scaffolds can be easily prepared by the coupling of heteroaromatic phenols (pyridines, pyrimidines) with carbonyl compounds, amines, and isocyanides. This transformation related to the Ugi reaction probably involves a Smiles rearrangement. The scope of this methodology is further extended by the successful use of heterocyclic thiols to form highly functionalized thioamides.
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Kaïm et al. (2006) studied this question.
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