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.
The electrochemicalreductiveacylation of 2,3-disubstituted 1-indenones in the presence of acetic anhydride in aprotic media such as DMF, DMSO, and aceto-nitrile gave 2,3-disubstituted 1-acetoxy-1H-indenes (2) and 1,2-disubstituted 3-acetoxy-1H-indenes (3) in good yields. The ratios of 2 to 3 in the products were affected by the substituents.
Rapid Access to Substituted Indenones through Grignard Reaction and Its Application in the Synthesis of Fluorenones Using Ring Closing Metathesis
作者:Nabin Parui、Tirtha Mandal、Jyotirmayee Dash
DOI:10.1002/ejoc.202201285
日期:2023.2.13
Indenones are synthesized using a practical and scalable method. The addition of Grignard reagents to indene-1,3-diones provides 2,3-disubstituted indenones through dehydrative aromatization. Significantly, a naturally occurring neo-lignan has been synthesised in one pot. Moreover, diallyl indenones have been utilized as ring-closing metathesis (RCM) precursors for synthesising fluorenones through