The lithiation of methoxy- and methylenedioxy-bemyl alcohols is described; subsequent reactions with ethyl chloroformate and carbon dioxide to form phthalides have been investigated, and are compared with metallation-carboxylation of alternative substrates. The preparation of phthalideisoquinoline analogues by this method proceeds only in low yields due to the acidity of the benzylic position in the benzylisoquinoline precursor.

Ethyl 5-oxo-2,5-dihydroisoxazole-4-carboxylate has been treated with a number of chlorinated heterocycles to yield the corresponding substitution products: ethyl 2-(isoquinolin-1-yl)-5-oxo-2,5-dihydroisoxazole-4-carboxylate, ethyl 5-oxo-2-(quinolin-2-yl)-2,5- dihydroisoxazole-4-carboxylate, ethyl 5-oxo-2-(purin-2-yl)-2,5- dihydroisoxazole-4-carboxylate, ethyl 5-oxo-2-(pyrimidin-2-yl)-2,5-dihydroisoxazole-4-carboxylate, ethyl 2-(6-chlorpyridazin-3-yl)-5-oxo- 2,5-dihydroisoxazole-4-carboxylate, ethyl 2-(benzothiazol-2-yl)-5-oxo- 2,5-dihydroisoxazole-4-carboxylate, 2- and 6-(4-ethoxycarbonyl-5-oxo-2,5-dihydroisoxazol-2-yl)pyridine-3-carboxylic acid, ethyl 5-oxo- 2-(2-phenylquinazolin-4-yl)-2,5-dihydroisoxazole-4-carboxylate and ethyl 2-(2,4-diaminotriazin-2-yl)-5-oxo-2,5-dihydroisoxazole-4- carboxylate . The compounds generally cause loss of motor control in mice, but are relatively toxic.

The reactions of isoquinoline and phthalazine Reissert compounds with phthalaldehydic acids and their derivatives have been investigated as a means of synthesizing 1-(3-phthalidyl)isoquinolines. Of a variety of conditions tried those involving phase transfer were found, in general, to be the most suitable. The products, which are analogues of the convulsant alkaloid bicuculline, showed weak central nervous system depressant activity.

The cyclization of N-acyl-N'-arylureas in polyphosphoric acid has been reinvestigated. The product is not only the 4-substituted quinazolin-2(1H)-one as reported, but also contains the 2-acylaniline in major proportions. Two minor products have also been isolated. At 80�, an intermediate has been detected, the properties of which are consistent with it being the corresponding 2-acylphenyl- urea. Acyl ureas with strongly electron-withdrawing acyl groups form major amounts of the corresponding anilide by the formal loss of cyanic acid. The application of this reaction to the synthesis of quinazolinylphthalides has been investigated.

Das aus (Ia) erhaltene Harnstoffderivat (Ib) wird mit entsprechenden Säurechloriden (II) oder Säuren [wie (III)] zu den Verbindungen (IV) acyliert, die mit PPA zu den Chinazolinonen (V) cyclisiert werden; Nebenprodukte sind die Acylaniline (VI).