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REACTION OF THIOAMIDES WITH 2,3-DICHLORO-1,4-NAPHTHOQUINONE. A NOVEL SYNTHESIS OF NAPHTHOTHIAZOLE-4,9-DIONES
Hammam, A.S.,Bayoumy, B.E.
, p. 71 - 79 (2007/10/02)
The reaction of thioamide II with 2,3-dichloro-1,4-naphthoquinone (I) in ethanol gave naphtho-thiazole-4,9-diones (IV).The intermediates, 2-thioamido-3-chloro-1,4-naphthoquinones III were also isolated from the reaction medium and could be separately transformed to IV by further boiling in aqueous ethanol containing bicarbonate.The reaction of thiosemicarbazide with I under similar conditions gave naphtho-2-amino-4H-1,3,4-thiadiazine-5,10-dione (VII).
