Reaction of 2-substituted 5- and 6-aminobenzoxazoles 1 and 2 with diethyl ethoxymethylenemalonate afforded the corresponding diethyl 3-N-(5- and 6-benzoxazolyl)aminomethylenemalonates 3 and 4. Under conditions of the Gould-Jacobs reaction, the compounds 3 gave a mixture of angularly and linearly annelated oxazolo[4,5-f]quinolones 5 and oxazolo[5,4-g]quinolones 6, and compounds 4 afforded a mixture of oxazolo[5,4-f]quinolones 7 and oxazolo[4,5-g]quinolones 8.
2-取代-5-和6-氨基苯并噁唑醇1和2与乙基乙氧甲亚甲基丙二酸二乙酯反应,得到相应的乙基3-(5-和6-苯并噁唑基)氨基亚甲基丙二酸二乙酯3和4。在Gould-Jacobs反应条件下,化合物3生成角状和线性连接的噁唑并[4,5-f]喹啉酮5和噁唑并[5,4-g]喹啉酮6的混合物,而化合物4生成噁唑并[5,4-f]喹啉酮7和噁唑并[4,5-g]喹啉酮8的混合物。