Kalogirou, Andreas S. published the artcileSynthesis and Reactivity of 3′,5′-Dichloro-1H-spiro(quinazoline-2,4′-[1,2,6]thiadiazin)-4(3H)-ones, Formula: C7H6N2, the main research area is chloro spiro quinazoline thiadiazine derivative synthesis reactivity.
A three-step synthesis of 3′,5′-dichloro-1H-spiro(quinazoline-2,4′-[1,2,6]thiadiazin)-4(3H)-ones starting from 3,4,4,5-tetra-chloro-4H-1,2,6-thiadiazine (I) is presented. The latter reacts with 2-aminobenzonitriles to give 2-[(3,5-dichloro-4H-1,2,6-thiadiazin-4-ylidene)amino]benzonitriles [e.g., I + 2-aminobenzonitrile → II (86%)] , which affords, after hydration, the resp. benzamides [II → III (84%)]. Upon heating at reflux in EtOH or HFIP, the benzamides intramolecularly cyclize onto the thiadiazine C4 position to give 3′,5′-dichloro-1H-spiro(quinazoline-2,4′-[1,2,6]thiadiazin)-4(3H)-ones [III → IV (95% in EtOH, 97% in HFIP)]. Single crystal X-ray crystallog. supports the structure of two analogs. The chloride displacement of these new spiroquinazolinones was demonstrated by Stille coupling, and by reaction with methoxide to afford both the mono and bis-methoxy derivatives
European Journal of Organic Chemistry published new progress about Benzamides Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation) (anthranilonitriles → [(dichlorothiadiazinylidene)amino]benzamides). 1885-29-6 belongs to class nitriles-buliding-blocks, name is 2-Aminobenzonitrile(Flakes or Chunks), and the molecular formula is C7H6N2, Formula: C7H6N2.
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts