741633-48-7Relevant articles and documents
Stereoselective synthesis of (?)-3-PPP through palladium-catalysed unactivated C(sp3)–H arylation at the C-3 position of L-pipecolinic acid
Zhang, Shi-Jin,Sun, Wen-Wu,Yu, Qun-Ying,Cao, Pei,Dong, Xiao-Ping,Wu, Bin
supporting information, p. 606 - 609 (2017/01/25)
An efficient route for the preparation of (?)-3-PPP(preclamol) using the highly stereoselective palladium-catalysed C(sp3)-H arylation and radical decarboxylation reaction as the key steps is described. The chiral center at the C-3 position of
The synthesis and conformational analysis of optical isomers of 4-phenyl-perhydropyrido[1,2-a]pyrazine-1,3-dione: an example of 'solid state-frozen' dynamics in nitrogen-bridged bicyclic 2,6-diketopiperazines
Dawidowski, Maciej,Herold, Franciszek,Wilczek, Marcin,Kleps, Jerzy,Wolska, Irena,Turlo, Jadwiga,Chodkowski, Andrzej,Widomski, Pawel,Bielejewska, Anna
experimental part, p. 1759 - 1766 (2009/12/28)
The synthesis, chemical properties, and conformational analysis of enantiopure (4R,9aS)-, (4S,9aR)-, (4S,9aS)-, and (4R,9aR)-4-phenyl-perhydropyrido[1,2-a]pyrazine-1,3-diones having potential biological activity are described. An interesting example of the coexistence of two invertomers of the (4R,9aR)-diastereomer in a single crystal unit cell is reported. The invertomers differ in the cis/trans-relationship between the fused rings and in the absolute configuration at the chiral nitrogen atom. The structure and equilibrium distributions of the respective conformers have been determined by NMR spectroscopy in both polar and non-polar solvents at various temperatures. The NMR spectra show that dynamic processes in the imide parts of the interconverting species are restrained by self-aggregation. The (4S,9aR)-diastereomer exists in a single conformation with insignificant dynamic effects.