Palladium-Catalyzed Carbocyclization of Alkynyl Ketones Proceeding through a Carbopalladation Pathway
作者:Natalia Chernyak、Serge I. Gorelsky、Vladimir Gevorgyan
DOI:10.1002/anie.201006751
日期:2011.3.1
Dig this: 5‐exo‐dig carbocyclization of 1 into 2 features intramolecular carbopalladation of alkyne with Pd enolate (see scheme). DFT calculations show that the key Pd enolate forms by deprotonation assisted byb PdII acetate. Subsequent intramolecular alkyne carbopalladation, Z–E isomerization of the formed vinyl palladium species, and protiodepalladation leads to E‐alkylidene indanones.
α-Carbonyl Radicals from <i>N</i>-Enoxybenzotriazoles: De Novo Synthesis of 9-Phenanthrols
作者:Quynh H. Nguyen、Tae-Woong Um、Seunghoon Shin
DOI:10.1021/acs.orglett.2c03356
日期:2022.11.18
donors or alcoholic solvents led to α-carbonylradicals. The utility of the α-carbonylradicals was demonstrated in intramolecular tandemcyclization and in the synthesis of 9-phenanthrols and their analogues. The mechanistic experiments suggested that quenching of the reactive benzotriazolyl radical by the alcohol was accompanied by the formation of an α-hydroxy radical that mediated hydrogen atom transfer