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利用Diels-Alder反应合成了取代的吡啶并[1,2-a]苯并嘧唑类化合物和1,4一二取代的吡啶类化合物。将I_a、I_b、I_c和Ⅳ分别与马来酸酐反应得到相应的Ⅲ_a、Ⅲ_b、Ⅲ_c和Ⅵ。
Substituted pyrido [1,2-a] benzopyrazoles and 1,4-disubstituted pyridines were synthesized by Diels-Alder reaction. Reaction of I_a, I_b, I_c and Ⅳ with maleic anhydride respectively gives the corresponding Ⅲ_a, Ⅲ_b, Ⅲ_c and Ⅵ.