Access to 3‐(2‐Oxoalkyl)‐azaspiro[4.5]trienones
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Acid‐Triggered Oxidative Cascade Reaction through Alkenyl Peroxide Radical Intermediate
作者:Chang‐Sheng Wang、Thierry Roisnel、Pierre H. Dixneuf、Jean‐François Soulé
DOI:10.1002/adsc.201801203
日期:2019.2
Azaspiro[4.5]trienones bearing ketone side chains at the 3‐position are prepared from N‐alkyl‐arylpropiolamides and ketones via oxidative 1,2‐difunctionalization of alkynes. The cascade sequence starts with the generation of alkenyl peroxide intermediates, which are obtained by addition of tert‐butyl hydroperoxide to ketones in presence of a catalytic amount of a strong acid. Then, the ketone radical adds to
由N-烷基-芳基丙丙酰胺和酮经炔烃的1,2-二官能团氧化制得在3位带有酮侧链的Azaspiro [4.5]三烯酮。级联序列始于过氧化烯基中间体的产生,这是通过在催化量的强酸存在下将叔丁基氢过氧化物加到酮中而获得的。然后,酮自由基加成炔烃,随后进行螺环化和脱芳香化过程。该方法代表了炔烃双官能化的一个新实例,该一步同时形成了两个碳-碳单键和一个碳-氧双键。