Pyrrolo[1,2-c]imidazole derivatives of the formula ##SPC1## Wherein R is a lower alkyl, a phenyl or a benzyl radical, R.sub.1 is hydrogen, a lower alkyl or a phenyl radical and R.sub.2 is hydrogen or a lower alkyl radical. The compounds have C.N.S. activity.
Pyrrolidine derivatives of formula (I) are disclosed. ##STR1## wherein the ring A represents the following heterocyclic ring ##STR2## The compounds of formula (I) are useful as nootropic agents.
![Pyrrolo[1,2-c]imidazole-1-one derivatives - US Patent 3901911 - Page 1](http://www.wikipatents.com/pyrrolo12-cimidazole-1-one-derivatives/T/US3901911-1.jpg "Pyrrolo[1,2-c]imidazole-1-one derivatives - US Patent 3901911 - Page 1")
![Pyrrolo[1,2-c]imidazole-1-one derivatives - US Patent 3901911 - Page 2](http://www.wikipatents.com/pyrrolo12-cimidazole-1-one-derivatives/T/US3901911-2.jpg "Pyrrolo[1,2-c]imidazole-1-one derivatives - US Patent 3901911 - Page 2")
![Pyrrolo[1,2-c]imidazole-1-one derivatives - US Patent 3901911 - Page 3](http://www.wikipatents.com/pyrrolo12-cimidazole-1-one-derivatives/T/US3901911-3.jpg "Pyrrolo[1,2-c]imidazole-1-one derivatives - US Patent 3901911 - Page 3")
![Pyrrolo[1,2-c]imidazole-1-one derivatives - US Patent 3901911 - Page 4](http://www.wikipatents.com/pyrrolo12-cimidazole-1-one-derivatives/T/US3901911-4.jpg "Pyrrolo[1,2-c]imidazole-1-one derivatives - US Patent 3901911 - Page 4")
![Pyrrolo[1,2-c]imidazole-1-one derivatives - US Patent 3901911 - Page 5](http://www.wikipatents.com/pyrrolo12-cimidazole-1-one-derivatives/T/US3901911-5.jpg "Pyrrolo[1,2-c]imidazole-1-one derivatives - US Patent 3901911 - Page 5")
![Pyrrolo[1,2-c]imidazole-1-one derivatives - US Patent 3901911 - Page 6](http://www.wikipatents.com/pyrrolo12-cimidazole-1-one-derivatives/T/US3901911-6.jpg "Pyrrolo[1,2-c]imidazole-1-one derivatives - US Patent 3901911 - Page 6")
![Pyrrolo[1,2-c]imidazole-1-one derivatives - US Patent 3901911 Drawing](http://www.wikipatents.com/us/3901911.png "Pyrrolo[1,2-c]imidazole-1-one derivatives - US Patent 3901911 Drawing")
