Facile one-step synthesis of 2,5-diketopiperazines
作者:Xianyu Sun、Rachita Rai、Alexander D. MacKerell、Alan I. Faden、Fengtian Xue
DOI:10.1016/j.tetlet.2014.01.133
日期:2014.3
We report a one-step protocol for the general synthesis of 2,5-diketopiperazines from an Fmoc-protected amino acid and an amino acid ester. The application of the method is highlighted by rapid and efficient preparation of various 2,5-diketopiperazines.
Dibutylphosphate (DBP) mediated synthesis of cyclic N,N′-disubstituted urea derivatives from amino esters: a comparative study
作者:Sumit K. Agrawal、Manisha Sathe、A.K. Halve、M.P. Kaushik
DOI:10.1016/j.tetlet.2012.08.083
日期:2012.11
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