597558-90-2Relevant articles and documents
Stereoselective pyrroline-ring formation through the cyclization of conjugated azomethine ylides at the periphery of pyrido[1,2-a]pyrimidine system
Noguchi, Michihiko,Shirai, Masashi,Nakashima, Kuniko,Arai, Ichiro,Nishida, Akiko,Yamamoto, Hidetoshi,Kakehi, Akikazu
, p. 4581 - 4590 (2007/10/03)
The thermal reaction of N-benzyl-N-[3-(N-substituted imino)methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-2-yl]amino acid esters, generated from aldehyde esters and primary amines, provides 2,3-dihydropyrido[1,2-a]pyrrolo[2,3-d]pyrimidin-4(1H)-one derivatives effectively and stereoselectively. Therein, the stereoselective generation of conjugated azomethine ylides from the imine esters and their cyclization is essential for the pyrroline-ring formation.