Intramolecular dehydrogenative cyclization involving twofold Csp2–H bond cleavages directed by the amino- or carboxy group proceeds smoothly when using a rhodium–copper catalyst system under air as the terminal oxidant. A variety of fluorene derivatives can be prepared by the environmentally benign procedure.
在
氨基或羧基的引导下,使用
铑-
铜催化体系在空气中作为终极氧化剂,涉及两次Csp2–H键断裂的分子内脱氢环化反应顺利进行。通过这种环保的方式,可以制备多种
氟烯衍
生物。