Acetone → hexahydro-3,3-dimethylimidazo(1,5-a)pyrazin-1(5H)-one

Participants

Reaction Steps

To a stirred and warm solution of 3 parts of 2-piperazinecarboxamide in 16 parts of 2-methoxyethanol were added 51.2 parts of 2-propanone. The whole was stirred and refluxed for 20 hours. The reaction mixture was evaporated. The solid residue was crystallized from acetonitrile, yielding 2.5 parts (64%) of hexahydro-3,3-dimethylimidazo[1,5-a]pyrazin-1(5H)-one; mp. 174.2° C. (intermediate 83).

Provenance & Evidence