28 research outputs found
(E)-2-(1-Cyano-2-methoxy-2-oxoethylidene)-3,4-dioxo-1- (pyridin-1-ium-1-yl)cyclobutan-1-ide
(E)-2-(1-Cyano-2-methoxy-2-oxoethylidene)-3,4-dioxo-1-(pyridin-1-ium-1-yl)cyclobutan-1-ide was obtained by a three-component reaction of squaric acid dichloride with pyridine and methyl cyanoacetate
1-(Imidazo[1,2-a]pyridin-1-ium-1-yl)-2,3,4-trioxocyclobutan-1-ide
1-(Imidazo[1,2-a]pyridin-1-ium-1-yl)-2,3,4-trioxocyclobutan-1-ide was obtained by reaction of squaric acid with imidazo[1,2-a]pyridine in acetic anhydride
3-(1<em>H</em>-Indol-3-yl)-4-(morpholin-4-yl)cyclobut-3-ene-1,2-dione
3-(1<em>H</em>-Indol-3-yl)-4-(morpholin-4-yl)cyclobut-3-ene-1,2-dione was obtained in good yields (72–82%) by nucleophilic substitution of 3-chloro-4-(1<em>H</em>-indol-3-yl)cyclobut-3-ene-1,2-dione with morpholine