Convenient generation of 1,3-dipolar nitrilimines and [3 + 2] cycloaddition for the synthesis of spiro compounds
作者:Mei-Jun Zhu、Rong Ye、Wen-Jing Shi、Jing Sun、Chao-Guo Yan
DOI:10.1016/j.tetlet.2022.154186
日期:2022.11
In the presence of 2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) as an oxidizer, the domino [3 + 2] cycloaddition reaction of aldohydrazones with 2-arylidene-1,3-indnaediones or 5-arylidene-1,3-dimethylbarbituric acids in acetonitrile at 80 °C afforded functionalized spiro[indene-2,4′-pyrazoles]-1,3-diones or 2,3,7,9-tetraazaspiro[4.5]dec-1-ene-6,8,10-triones in satisfactory yields. This reaction
在 2,2,6,6-四甲基哌啶-1-基)氧基 (TEMPO) 作为氧化剂存在下,醛腙与 2-亚芳基-1,3-茚二酮或 5- 的多米诺 [3 + 2] 环加成反应亚芳基-1,3-二甲基巴比妥酸在乙腈中于 80 °C 提供官能化螺[茚-2,4'-吡唑]-1,3-二酮或 2,3,7,9-四氮杂螺[4.5]dec-1- ene-6,8,10-triones 的收率令人满意。该反应被认为是通过原位产生反应性1,3-偶极腈亚胺及其与环状亲偶极体的连续1,3-偶极环加成反应进行的。因此,成功开发了一种新的方便的活性偶极腈亚胺合成方法。