Synthesis. 2-Propionyl-1- pyrroline [l-(Azacyclopent--1e n-
2-yl)-I-propanonel. In a first step 2-propionylpyrrole was
synthesized from pyrrylmagnesium iodide and propionyl chloride
(Oddo, 1910). Hydrogenation and partial reoxidation of the pyrrole
derivative were then performed according to the method
described by Buttery et al. (1982) for the related 2-acetyl-l-pyrroline
with some modifications: 2-propionylpyrrole (20 mmol)
was dissolved in methanol (30 mL) and, after addition of rhod-