| Popis: |
Quinolizidine alkaloids (QA), of which more than 170 structures have been reported (overviews in: Mears and Mabry 1971; Kinghorn and Balandrin 1984; Salatino and Gottlieb 1980; Wink 1993), are distinct from other alkaloids in that they contain at least one quinolizidine ring system. According to the degree of substitution at least seven different groups can be distinguished: (1) the lupinine-type, (2) the Leontidine-type, (3) the sparteine/lupanine/ multiflorine-type, (4) the alpha-pyridone-type, (5) the matrine-type, (6) the Ormosia-type, and (7) piperidine and dipiperidines, which often occur together with QA (Fig. 1). |
