[Synthesis, absolute configuration and mass spectroscopic fragmentation of the circulation analeptic cafedrine (author's transl)]. / Synthese, absolute Konfiguration und massenspektroskopische Fragmentierung des kreislaufanaleptisch wirksamen Cafedrin.

The synthesis of [R-(R*,S*)]-7-[2-[(2-hydroxy-1-methyl-2-phenylethyl)amino]-ethyl]-3,7-dihydro-1 ,2-dimethyl-1H-purine-2,6-dione (Cafedrine) and its stereoisomers is reported. By means of 1H- and 13C-nmr spectroscopy the relative configuration of the two asymmetric centres is ascertained and the absolute configuration is discussed. The EI-mass spectrometric fragmentation of cafedrine has been elucidated.