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Oxazole Synthesis from Acetylenes and Nitriles

Oxazoles are relatively common heterocyclic rings, but are not always the easiest rings to prepare by de novo synthesis.  Two recent papers describe new methods for the preparation of these compounds1,2. In the first paper1, a heterogeneous gold catalyst (MCM-41-Ph3PAuNTf2) is used prepare oxazoles from an acetylene, a nitrile with the oxygen atom coming from

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