2-Oxa-7-azaspiro[4.4]nonane-8,9-diones were newly synthesized in good yields by the Mn(III)-based reaction of a mixture of 1,1-diarylethenes and 4-acylpyrrolidine-2,3-diones. Under the stated reaction conditions, the pyrrolidinedione ring remained intact and became one of the two rings of the 2-oxa-7-azaspiro[4.4]nonanedione scaffold. The procedure was simple and the product was easily separated. The structure determination and the mechanism for the formation of the 2-oxa-7-azaspiro[4.4]nonanediones were also discussed.

中文翻译：

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一锅合成2-氧杂-7-氮杂螺[4.4]壬烷-8,9-二酮，使用基于Mn（III）的4-酰基吡咯烷-2,3-二酮氧化

通过基于Mn（III）的1,1-二芳基蒽和4-酰基吡咯烷-2,3-混合物的Mn（III）反应，以高收率新合成了2-Oxa-7-azaspiro [4.4] nonane-8,9-diones。 diones。在规定的反应条件下，吡咯烷二酮环保持完整，并成为2-oxa-7-azaspiro [4.4] nonanedioneone支架的两个环之一。程序很简单，产品很容易分离。还讨论了2-oxa-7-azaspiro [4.4]壬型阴离子的结构测定和形成机理。