将取代色满酮 ( 1 )与芳肼反应生成的腙与 HNCO发生 [3 +2 ]环加成反应 ,加成产物 ( 2 )经氧化得到偕偶氮异氰酸酯 ( 3 ) .化合物 3在 HBF4 的催化下发生环化 -重排反应 ,得到新颖的三环系 2 -氧代 -1 ,2 ,4-三唑并[3 ,2 -d][1 ,5 ]苯并氧氮杂化合物 5 a～ 5 g The hydrazone formed by the reaction of the substituted chromone (1) with the aryl hydrazine undergoes a [3 + 2] cycloaddition reaction with HNCO and the addition product (2) is oxidized to form the azoisocyanate (3) The cyclization-rearrangement reaction catalyzed to give the novel tricyclic 2-oxo-1,2,4-triazolo [3,2-d] [1,5] benzoxazepine compound 5 a ~ 5 g