Abstract
Fusion of diethyl methylimino-diacetate or diethyl methylimino-dipropionate with 3, 4-dimethoxyphenethylamine affords, besides the corresponding diamide compounds, 1-(3, 4-dimethoxyphenethyl)-4-methyl-2, 6-dioxopiperazine and 1, 5-diazacycloöctane-2, 8-dione. Isoquinoline cyclization of the diamide with phosphoryl chloride effects cyclization of only one of the amides and the other remains per se. The treatment of this isoquinoline derivative further with phosphorus pentachloride in chloroform did not effect further isoquinoline cyclization of the remaining amide and the starting compound was recovered intact.
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