between a substituted 2H‐pyran‐2‐one and styrene derivatives, followed by the elimination of CO2 and aromatization (oxidation). The last step was found to be efficiently promoted by the application of chloranil as the oxidant. Alternatively, activated carbon Darco KB could also act as the dehydrogenation catalyst necessitating a larger excess of the styrene to act as the hydrogen acceptor.
我们描述了一种三步一锅法无
金属多米诺法,该方法可产生一组Boscalid衍
生物,母体化合物是高度重要的农业
化学试剂。该过程的第一步包括取代的
2H-吡喃-2-酮与
苯乙烯衍
生物之间的Diels-Alder反应,然后消除CO 2和芳香化(氧化)。发现通过使用
氯腈作为氧化剂可以有效地促进最后一步。或者,
活性炭Darco KB也可以用作脱氢催化剂,需要大量过量的
苯乙烯作为氢受体。