Polyconjugated nitrodienynes/nitroenynes as nitroolefin derivatives are good kind of electrophiles and have been widely used in organic synthesis. There are multiple reaction sites due to the conjugated system. Therefore, competitive reactions of regioselectivity in the reaction process are existence, such as 1,4-addition reaction, 1,6-addition reaction, and even 1,8-addition reaction. The recent progress of the synthesis of nitrodienynes/nitroenynes and their applications in organic synthesis are summarized.
A new cycloaddition reaction of quinone imine ketals (QIKs), which could be utilized to the construction of functionalized azaspirocyclics under mild conditions, is described. This transformation involved a [2+2] cycloaddition reaction between QIKs and allenoates catalyzed by DABCO, and then treatment with 1 N HCl in one-pot. The strategy could provide a practical route to access azetidine-fused spirohexadienones in good to excellent yields and with high E-selectivity.
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