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1,3-dipolar cycloadditions of aldehydes or Imines with carbonyl ylides generated from epoxides: Classical heating and microwave irradiation

机译:醛或亚胺与环氧化物生成的羰基化物的1,3-偶极环加成反应:经典加热和微波辐射

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摘要

Cycloadditions of aldehydes with carbonyl ylides to give dioxolanes have been carried out without solvent under microwave irradiation. The reactions proceeded in similar yields and stereoselectivities, but in shorter reaction times, than those obtained in toluene at reflux using an oil bath. Cycloadditions conducted between imines and carbonyl ylides using the same protocol were less efficient because the oxazolidines formed proved unstable under the reaction conditions.
机译:在微波辐射下,在没有溶剂的情况下,进行了醛与羰基化合物的环加成反应以生成二氧戊环。与使用油浴在回流下在甲苯中获得的反应相比,反应以相似的产率和立体选择性进行,但反应时间更短。在亚胺和羰基化物之间使用相同的方案进行的环加成反应效率较低,因为在反应条件下形成的恶唑烷被证明不稳定。

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