【摘要】 取代苯并二氢吡喃 4 酮 ( 1)的芳腙在冰醋酸中与KNCO发生 [3 +2 ]环加成反应 ,加成产物经KMnO4氧化开环得偕偶氮异氰酸酯 ( 3 ) .3在HBF4的催化下发生环化 -重排反应 ,合成得到一系列新型 6 7 5三环系 1,2 ,4 三唑并 [3 ,2 d] [1,5 ]苯并氧氮杂 2 酮 ( 5a～ 5g) .由X单晶衍射测定了化合物 5a的晶体结构更多还原

【Abstract】 A series of novel tricyclic O,N-heterocycles 5a～5g, a kind of unprecedented 1,2,4-triazolo[3,2-d]~[1,5]benzoxazepin-2-ones, have been achieved via acid-induced ring closure of isocyanatoarylazo compounds 3, which were prepared from chroman-4-one in three steps, followed by feasible rearrangement. The structural assignment of 5a has been ultimately accomplished by X-ray diffraction analysis.更多还原