The rhodium(II) acetate-catalyzed reaction of diacyldiazomethanes such as dibenzoyldiazomethane, acetylaroyldiazomethanes, diacetyldiazomethane, and diazodimedone with isothiocyanates gave 2-thioxo-2H-1,3-oxazin-4(3H)-ones through the [4+2] cycloaddition of isothiocyanates with acylketenes which were derived by the Wolff rearrangement of the diacyldiazomethanes. Migration aptitude of methyl and aryl groups was discussed in the reaction of acetylaroyldiazomethanes.
在
乙酸铑(II)催化下,二苯甲酰二氮杂
环丁烷、乙酰甲酰二氮杂
环丁烷、
二乙酰二氮杂
环丁烷和重氮
二甲酮等
二乙酰二氮杂
环丁烷与异
硫氰酸盐发生反应,生成 2-
硫酮-2H-1、3-恶嗪-4(3H)-酮、通过异
硫氰酸酯与酰基烯烃的[4+2]环加成反应,得到 2-
硫酮-2H-1, 3-恶嗪-4(3H)-酮。讨论了甲基和芳基在乙酰芳基二氮杂环
甲烷反应中的迁移能力。