Under the catalysis of Rh2(OAc)4 (10 mol%) and (±)‐Me‐Pybox (20 mol%) in 1,2‐DCE at 80℃, the homocoupling/[4+1] cycloaddition cascade of diazobarbiturates with diazopyrazolones proceeded readily and provided spirobarbiturates in 32%–88% chemical yields. The chemical structure of the obtained spirobarbiturates was identified by X‐ray diffraction analysis.

中文翻译：

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Rh(II)-催化重氮巴比妥类与重氮吡唑酮类的自偶联/[4+1]环加成级联制备螺巴比妥类

在 80℃ 1,2-DCE 中，Rh2(OAc)4 (10 mol%) 和 (±)-Me-Pybox (20 mol%) 催化下，重氮巴比妥类化合物发生自偶联/[4+1]环加成级联反应重氮吡唑啉酮很容易进行并以 32%–88% 的化学产率提供螺巴比妥类药物。通过X射线衍射分析鉴定了所获得的螺巴比妥酸盐的化学结构。