Tetrahedron Letters p. 5996 - 5999,4 (2012)
Update date:2022-08-04
Topics:
Agrawal, Sumit K.
Sathe, Manisha
Kaushik, M. P.
Halve, A. K.
The N,N′-disubstituted urea derivatives such as amino acid hydantoins and dihydrouracil derivatives were prepared starting from natural and unnatural amino acid esters using dibutylphosphate (DBP). During the attempted synthesis of N-heterocycles with larger than six-membered rings containing the N,N′-disubstituted urea functionalities, three unexpected products namely squamolone, N-methyl pyrrolidine-2-one, and diketopiperazine were isolated.
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