InCl<sub>3</sub>-Catalyzed Synthesis of 1,2-Dimetallic Compounds by Direct Insertion of Aluminum or Zinc Powder
作者:Tobias D. Blümke、Thomas Klatt、Konrad Koszinowski、Paul Knochel
DOI:10.1002/anie.201205169
日期:2012.9.24
In‐sertion of metal: Catalytic amounts of InCl3 allow the insertion of aluminum and zinc into aromatic 1,2‐dibromides or 1,2‐bromotriflates (see scheme). These 1,2‐dimetallic species can undergo Cu or Pd‐catalyzed acylations, allylations, or cross‐couplings.
Synthesis of Fluorenone Derivatives through Pd-Catalyzed Dehydrogenative Cyclization
作者:Hu Li、Ru-Yi Zhu、Wen-Juan Shi、Ke-Han He、Zhang-Jie Shi
DOI:10.1021/ol302181z
日期:2012.9.21
Palladium-catalyzed dual C–H functionalization of benzophenones to form fluorenones by oxidative dehydrogenative cyclization is reported. This method provides a concise and effective route toward the synthesis of fluorenone derivatives, which shows outstanding functional group compatibility.
Palladium(II)/magnesium–lanthanummixedoxide (Pd(II)/Mg–La mixedoxide) catalyst was used in the dehydrogenative cyclization of benzophenones to afford fluorenones. This protocol represents a direct and facile approach to accessing a variety of fluorenone derivatives by means of C–H activation under heterogeneous conditions. The catalyst was recovered by centrifugation and used for three consecutive
Palladium-Catalyzed Annulation of Arynes by 2-Halobenzaldehydes: Synthesis of Fluoren-9-ones
作者:Xiaoxia Zhang、Richard C. Larock
DOI:10.1021/ol0514597
日期:2005.9.1
Arynes, generated in situ from 2-(trimethylsilyl)aryl triflates and CsF, undergo annulation by o-haloarenecarboxaldehydes in the presence of a Pd catalyst, providing a useful new method for the synthesis of fluoren-9-ones in good yields. [reaction: see text]
Efficient Synthesis of Fluoren-9-ones by the Palladium-Catalyzed Annulation of Arynes by 2-Haloarenecarboxaldehydes
作者:Jesse P. Waldo、Xiaoxia Zhang、Feng Shi、Richard C. Larock
DOI:10.1021/jo8009215
日期:2008.9.1
Fluoren-9-ones and derivatives are readily prepared in good yields by the annulation of in situ generated arynes by 2-haloarenecarboxaldehydes in the presence of a palladium catalyst.