A Dieckmann Cyclization Route to Piperazine-2,5-diones
作者:Claude Larrivée Aboussafy、Derrick L. J. Clive
DOI:10.1021/jo3007144
日期:2012.6.1
Piperazine-2,5-diones are formed by Dieckmann cyclization (NaH, THF) of substructures of the type CH2-N(R)C(O)CH2N(R′)CO2Ph in which the terminal methylene (CH2) that is adjacent to nitrogen closes onto the carbonyl group of the phenyl carbamate unit at the other end of the chain. R and R′ are alkyl groups, and the terminal methylene is activated by a ketone carbonyl, a nitrile, an ester, or a phosphoryl