The [3 + 2]-cycloaddition reaction of nitrile imines with 2,2-dimethyl-5-[(4-oxo-4H-chromen-3-yl)methylene]-1,3-dioxane-4,6-dione tends to form the reverse-orientation products under ultrasound irradiation in EtOH in the presence of Et₃N. Evidence for the structure of product 5b was obtained from single-crystal X-ray analysis.

Graphic abstract

中文翻译：

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腈亚胺与 3-甲酰色酮-Meldrum 酸加合物的超声辅助 [3 + 2]-环加成反应中的反向取向

腈亚胺与2,2-二甲基-5-[(4-氧代-4 H-色烯-3-基)亚甲基]-1,3-二恶烷-4,6-二酮的[3 + 2]-环加成反应在Et ₃ N存在下，在EtOH 中超声照射下倾向于形成反向取向产物。产物5b的结构的证据是从单晶X 射线分析中获得的。

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