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The ant alkaloid myrmicarin 217 (1-ethyl-3,4,4a,5,6,7-hexahydro-2-propylpyrrolo-[2,1,5-cd]indolizine, 1) was synthesized using a new method for the direct cyclization of appropriately disubstituted piperidines. The mechanism for the formation of the pyrrolo[2,1,5-cd]indolizine system was investigated by 1 H-NMR spectroscopy, which showed the reaction to proceed through indolizidine intermediates...
The poison gland secretion of the African ant, Myrmicaria opaciventris, contains three families of new alkaloids. These alkaloids are represented by a monomeric type with 15 carbon atoms in a row forming derivatives of indolizines, while the two other families are dimers and trimers with 30 and 45 carbon atoms, respectively. The major constituents of the low molecular weight alkaloids...
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