Aus Anthranilamid (I) wurde auf drei Wegen die Titelverbindung (IV) erhalten durch Umsetzen mit (a) Säurechlorid (II) zu (III) und nachfolgende Reduktion, (b) mit Isatinsäureanhydrid (V) und (c) mit dem Benzotriazinon (V).

The synthesis of bis-(I -phenylimidazo[1,5-a]pyridin-3-y1) disulphide, its 3-phenyl 1 ,I '-linked analogue, bis-(2phenylimidazo[l,2-a]pyridin-3-yl) disulphide, bis-(3-methyl-2-phenylindolizin-l -yl) disulphide, and bis-(or-2pyridylbenzyl) disulphide is described, and also the synthesis of the corresponding 1 -and 3-phenylimidazo[1,5-a]pyridine monosulphides. The action of methyl iodide and methyl fluorosulphonate on these mono-and disulphides is described, as is the action of alkali on the derived disulphide diquaternary salts.

Heterocyclic N-Oxides. Part V.l The Base-catalysed Cyclisation of N-S u bst it uted o-N it ro benza m ides to I ,4-Di h yd ro -1h yd roxy-4-oxoq u i nazol ines By G. Tennant and K. VaughanDerivatives of 1,4-dihydro-I -hydroxy-4-oxoquinazoline are formed, together with benzoic acid, when o-nitrobenzamidoacetonitrile is warmed with alcoholic solutions of sodium alkoxides. The ketone w-(o-nitrobenzamid0)acetophenone, heated under reflux with ethanolic sodium ethoxide gives the N-hydroxy-compound 1.4-dihydro-1 -hydroxy-4-oxoquinazoline, whereas in warm aqueous ethanolic alkali it affords 2-benzoyl-3.4-dihydro-4-0~0quinazoline. The cyclic hydroxamic acids 1,2,3,4-tetrahydro-I -hydroxy-2,4-dioxoquinazoline and 1,2,3,4tetrahydro-Ihydroxy-2,3-dioxoquinoxaline decompose at their melting points yielding the reduced compounds (M for OH a t position-I).

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