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■ Stereochemistry of Diastereomeric 9,10-Dimethoxy-1,3,4,6,7,11b-hexahydrospiro[banzo[a]quinolizin-2,5‘-imidazolidine]-2‘,4‘-diones

J. Carlos Meréndez and Mónica M. Söllhuber

*Departamento de Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad Complutense de Madrid, Ciudad Universitaria, 28040 Madrid, Spain

Abstract

The structures of the two diastereomeric title compounds obtained by the Bucherer-Bergs and Read procedures are respectively assigned to α and β isomers on the basis of ¹H -nmr, ¹³C-nmr and chemical reactivity data. Both compounds present a predominant trans conformation as shown by ir, ¹H-nmr and ¹³C-nmr data.