The 1,3-dipolar cycloaddition of 2-diazopropane 1 with N-arylcitraconimides and N-arylmaleimides 2, at −78°C, has led to monoadducts 3. The same addition of 2-diazopropane with maleimide 4, has led to a new and unexpected Δ3-1,3,4-oxadiazoline 5. Irradiation of the pyrazolines 3 led to clean extruction of nitrogen to give the cyclopropanes 6.
2-重氮丙烷 1 与 N-芳基柠康
酰亚胺和 N-芳基马来
酰亚胺 2 在 -78°C 下的 1,3-偶极环加成生成单加合物 3。
2-重氮丙烷与马来
酰亚胺 4 的相同加成产生了新的和出乎意料的 Δ3-1,3,4-恶二唑啉 5。
吡唑啉 3 的辐照导致氮的清洁挤出,得到
环丙烷 6。