The products of the photolysis of 2-(4-alkyl(or aryl)piperazino)-3-amino-1,4-naphthoquinones, their structure and subsequent thermal transformations

Article abstract of DOI:10.1007/BF00698958

Photolysis of 2-(4-alkyl(phenyl)piperazino)-3-amino-1,4-naphthoquinones affords 2-alkyl(phenyl)-1,2,3,4,12,12a-hexahydronaphtho<2',3':4,5>imidazo<1,2-a>pyrazine-6,11-diols which recyclize at elevated temperatures to yield 1,2,3,4-tetrahydro-13-alkyl(pheny