Browsing by Subject "Ring transformations"

Now showing items 1-3 of 3

Article

Ring transformations of 2-hydroxy-(4-chloro-5H-1,2,3-dithiazol-5-ylideneamino)arenes

Kalogirou, Andreas S.; Michaelidou, Sophia S.; Koyioni, Maria G.; Koutentis, Panayiotis Andreas (2015)

Abstract The cyclisation reactions of 2-(4-chloro-5H-1,2,3-dithiazol-5-ylidene-amino)phenol (5a), 3-(4-chloro-5H-1,2,3-dithiazol-5-ylideneamino)pyridin-2-ol (5b) and 2-(4-chloro-5H-1,2,3-dithiazol-5-ylideneamino)pyridin-3-ol ...
Article

Transformation of 2-(4-chloro-5H-1,2,3-dithiazol-5-ylideneamino)-6-ethoxy-4-phenylpyridine-3,5-dicarbonitrile into 4-aminopyrido[2,3-d]pyrimidines and 2-(pyrid-2-yl)guanidines

Kalogirou, Andreas S.; Michaelidou, Sophia S.; White, A. J. P.; Koutentis, Panayiotis Andreas (2015)

The reactions of 2-(4-chloro-5H-1,2,3-dithiazol-5-ylideneamino)-6-ethoxy-4-phenylpyridine-3,5-dicarbonitrile (14) with a range of primary and secondary amines are investigated. Treatment with n-BuNH2 and BnNH2 gave ...
Article

Two-step conversion of 3,4,4,5-tetrachloro-4H-1,2,6-thiadiazine into 4,5,6-trichloropyrimidine-2-carbonitrile

Kalogirou, Andreas S.; Manoli, Maria; Koutentis, Panayiotis Andreas (2017)

Tin reduction of 3,4,4,5-tetrachloro-4H-1,2,6-thiadiazine afforded perchloro-9-thia-1,5,8,10-tetraazaspiro[5.5]undeca-1,4,7,10-tetraene (10%) and 3,5-dichloro-4H-1,2,6-thiadiazine-4-thione (27%), the structures of which ...