DOI:
10.1055/s-00000084
Synthesis
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References
The cyclization was unexpected for the mild conditions used. We have found only one literature example of an intramolecular reaction between a urea and an ester leading to the formation of a dihydrouracil ring, promoted by phosphoric acid at 100 °C for 17 h; see: Uneyama K, Makio S, Nanbu H.
J. Org. Chem. 1989;
54: 872
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