2-Methy lamín o-1-cyclopen tene-1-dithiocarboxy lie acid (II) can be obtained in low yield from cyclopentanone with, carbon disulfide and methylamine; no other 2-alkylamino analogs can be synthesized. The amino group of 2-amino-1-cyclopen tene-1-d.ithiocarboxylic acid (I) and that of its methyl ester (VII) can be substituted by the alkylamino group by an amine exchange reaction, yielding the corresponding 2-alkylamino-1-cyclopen tene-1dithiocarboxylic acid (II) or its methyl ester (III-V, VIII-XII), respectively. The structures, including tautomeric forms of the synthesized compounds, were proved by ir and nmr spectroscopy.In previous research it was found that 2-amino-lcyclopentene-l-dithiocarboxylic acid (I) synthesized by Takeshima and coworkers8 exerts a marked antifungal action against various fungi.4 The steric arrangement of the functional groups in this compound permits the formation of six-membered chelates with metals, which fact may be responsible for the biological activity, too. Chelation plays an important role in the

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