W. Hanefeld et al., 3-(2,5-DIOXOPYRROLIDIN-1-YL), 3-(2,6-DIOXOPIPERIDIN-1-YL), AND 3-(1,3-DIOXOISOINDOLIN-2-YL)RHODANINES - A NOVEL TYPE OF RHODANINE DERIVATIVES, Journal of heterocyclic chemistry, 33(4), 1996, pp. 1143-1146
3-Aminorhodanine 2 was reacted with cyclic anhydrides yielding 3-(2,5-
dioxopyrrolidin-1-yl), 3-(2,6-dioxopiperidin-1-yl), and 3-(1,3-dioxois
oindolin-2-yl)rhodanine 6-8, which in turn were condensated in 5 posit
ion with several aldehydes yielding the new rhodanine derivatives 9-11
.