Abstract:The Diels-Alder reaction of substituted 5-methylenebarbituric acids with 2,3-dimethylbutadiene or cyclopentadiene results in the title compounds. Their structures were elucidated by IR, MS and NMR spectroscopy including application of shift reagents.Uber die Barbitursaure wurde 1864 durch von Baeyer erstmals berichtet'). Bis heute haben ihre Derivate -speziell die 5,5-disubstituierten -, besonders wegen der teilweise ausgepragten hypnotischen Wirkung", aber auch wegen der cyclischen Folge von Amidstrukturen ni… Show more
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