ChemInform Abstract: FACILE SYNTHESES OF 2H‐1,2,4‐BENZOTHIADIAZINE 1,1‐DIOXIDES AND 4‐OXO‐3,4‐DIHYDROQUINAZOLINES FROM 2‐AMINOBENZENESULFONAMIDE OR 2‐AMINOBENZAMIDE AND ALDEHYDES IN THE PRESENCE OF SODIUM HYDROGEN SULFITE

Abstract

Die Kondensation von 2‐Aminobenzolsulfonamid (II) mit Aldehyden (III) führt zu Dihydro‐benzothiadiazin‐dioxiden (I), in Gegenwart von Natriumhydrogensulfit zu dehydrierten Produkten (IV).

Selective synthesis of 2‐substituted 2,3‐dihydroquinazolin‐4(1H)‐ones and quinazolin‐4(3H)‐ones catalyzed by Schiff base dioxomolybdenum(VI) complex

“…When the reaction was carried out in water, few products were found ( 3a , 4a , Table 1, entry 14–15). Similar phenomenon was reported by Imai 39 in selective synthesis of benzothiazines. This indicates that which product is generated depends on the temperature not the solvent under air.…”