Heterocyclic nitrogen compounds. Part I. Some reactions of 3,6-dibenzylidene-2,5-dioxopiperazines
Abstract
2,5-Dioxopiperazine did not react with carbonyl reagents or condense with ketones. It condensed with aldehydes to give 3,6-dibenzylidene-derivatives. The latter reacted with Grignard reagents to give 1,4-addition on one side only.