3,4,7,8-Tetrahydro-7,7-dimethyl-2H-cyclopenta[4,5]pyrrolo[1,2-a]pyrazin-1(6H)-one

for the following products 4,4-Dimethyl-1,10-diazatricyclo[6.4.0.02,6]dodeca-2(6),7-dien-9-one | 7,7-Dimethyl-2,3,4,6,7,8-hexahydro-1H-cyclopenta[4,5]pyrrolo[1,2-a]pyrazin-1-one and 3,4,7,8-Tetrahydro-7,7-dimethyl-2H-cyclopenta[4,5]pyrrolo[1,2-a]pyrazin-1(6H)-one