8-Oxa-1,4-dithiaspiro[4.5]decane-7,9-dione and 9-oxa-1,5-dithiaspiro[5.5]undecane-8,10-dione, cyclic anhydrides formed in situ from the respective dicarboxylic acids in the presence of acetic anhydride, possess an enhanced reactivity and display a broad substrate scope in the Castagnoli-Cushman reaction with imines.

中文翻译：

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当外围问题很重要时：Castagnoli-8中的8-oxa-1,4-dithiaspiro [4.5] decane-7,9-dione和9-oxa-1,5-dithiaspiro [5.5] undecane-8,10-dione在Castagnoli-库什曼与亚胺的反应

由相应的二元羧酸原位形成的8-Oxa-1,4-二硫杂螺[4.5]癸烷-7,9-二酮和9-oxa-1,5-二硫杂螺[5.5]十一烷-8,10-二酮在乙酸酐的存在下，具有增强的反应性，并在与亚胺的Castagnoli-Cushman反应中显示出较宽的底物范围。