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A general route to the A-B-C ring system of phenanthridone alkaloids is available by acylation of 2-oxa-zolone with a 2-butadienylbenzoic acid derivative, followed by an intramolecular Diels-Alder reaction and hydrolysis.
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Reference：
Oxazolidine – Wikipedia,
Oxazolidine | C3H542NO – PubChem