Tandem Brønsted Acid Promoted and Nazarov Carbocyclizations of Enyne Acetals to Hydroazulenones
作者:Luz Escalante、Carlos González-Rodríguez、Jesús A. Varela、Carlos Saá
DOI:10.1002/anie.201205823
日期:2012.12.3
Ring the changes: Enyne acetals were easily converted into hydroazulene skeletons by a new and efficient metal‐free route involving a Brønsted acid promoted carbocyclization and a subsequent stereospecific Nazarov cyclization (see scheme). The versatility of this transformation also allowed assembly of interesting heteroaromatic tricyclic systems.
The polyphosphoric acid induced intramolecular acylation of lactones has been applied to the synthesis of the bicyclo [0,3,5] decane system, and the preparation of azulene, 1-methyl-, 2-methyl- and 1,3-dimethylazulene is reported.
Palladium-Catalyzed Intramolecular Oxidative Heck Cyclization and Its Application toward a Synthesis of (±)-β-Cuparenone Derivatives Supported by Computational Studies
oxidative cyclization of substituted homoallylic alcohols to form cyclic keto compounds under palladium-catalyzed conditions is described. The reaction has practical applications in the synthesis of sesquiterpenes. The mechanism of cyclization, the key step in the tandemreaction, was analyzed by using density functional theory calculations. A novel and efficient intramolecular oxidative cyclization of substituted
Palladium-catalyzed tandem oxidative cyclization of 1-bromohexa-1,5-dien-3-ols: easy access to cyclopentenones
作者:Sajal Kanti Mal、Devalina Ray、Jayanta K. Ray
DOI:10.1016/j.tetlet.2003.10.180
日期:2004.1
The novel Pd-catalyzed tandem cyclization of 1-bromohexa-1,5-dien-3-ols, prepared from the corresponding β-bromo-vinylaldehydes to cyclopentenone derivatives has been developed.
[EN] SYNTHESIS OF CYCLIC ORGANIC COMPOUNDS AND METALLOCENES<br/>[FR] SYNTHÈSE DE COMPOSÉS ORGANIQUES CYCLIQUES ET DE MÉTALLOCÈNES
申请人:UNIVATION TECH LLC
公开号:WO2019067273A1
公开(公告)日:2019-04-04
A method comprising synthesizing a cyclic organic compound via reaction of an unsubstituted or substituted cycloheptene with an unsubstituted or substituted acrylic acid in the presence of phosphoric and/or sulfonic acid reagent to make the cyclic organic compound. Also, a method of synthesizing a ligand for a transition metal, and a related substituted ligand-metal complex and catalyst, from the unsubstituted or substituted cycloheptene and unsubstituted or substituted acrylic acid. Also, the cyclic organic compound, ligand, and substituted ligand-metal complex and catalyst synthesized thereby. Also a method of polymerizing an olefin with the catalyst to give a polyolefin, and the polyolefin made thereby.