Synthesis of unsymmetrical 3,3′-biquinazoline-2,2′-diones by condensation of 3-aminoquinazolinones with benzoxazinones; fortuitous discovery, and further syntheses of 4-H-3-oxo-1,9a,10-triazaanthracen-9-ones
作者:Michael P. Coogan、Li-ling Ooi、Fabrizio Pertusati
DOI:10.1039/b419108k
日期:——
2' disubstituted 3,3' biquinazoline-4,4'-diones. The reaction is tolerant to a range of heteroatom and unsaturated functionality in the quinazolinone 2-position. However, treatment of 3-amino-2-hydroxymethyl-3H-quinazolin-4-ones with benz[1,3]oxazinone at high temperatures gave 4H-3-oxo-1,9a,10-triazaanthracen-9-ones, an unreported fused heterocyclic system, a more direct synthesis of which, replacing
2-烷基-或2-芳基-3-氨基喹唑啉-4-酮与苯并[1,3]恶嗪-4-酮的缩合产生不对称的2,2'二取代的3,3'联喹唑啉-4,4'-二酮。该反应可耐受喹唑啉酮2位上的一系列杂原子和不饱和官能团。然而,在高温下用苯并[1,3]恶嗪酮处理3-氨基-2-羟甲基-3H-喹唑啉-4-酮,得到4H-3-oxo-1,9a,10-triazaanthracen-9-one。未报道的稠合杂环系统,其更直接的合成方法是用原酸酯代替苯并恶嗪酮。