Palladium-Catalyzed Cyclization/Carboalkoxylation of Alkenyl Indoles
作者:Cong Liu、Ross A. Widenhoefer
DOI:10.1021/ja046810i
日期:2004.8.1
room temperature for 30 min led to cyclization/carboalkoxylation to form the corresponding tetrahydrocarbazole in 83% isolated yield as a single regioisomer. Palladium-catalyzed cyclization/carboalkoxylation of 2-(4-pentenyl)indoles tolerated substitution along the alkenyl chain and at the internal and cis-terminal olefinic positions. Palladium-catalyzed cyclization/carboalkoxylation tolerated a range
Scope and Mechanism of the PdII-Catalyzed Arylation/Carboalkoxylation of Unactivated Olefins with Indoles
作者:Cong Liu、Ross A. Widenhoefer
DOI:10.1002/chem.200500787
日期:2006.3.1
Stereochemical analyses of the palladium-catalyzed cyclization/carboalkoxylation of both 2- and 3-alkenyl indoles are in agreement with mechanisms involving outer-sphere attack of the indole on a palladium-olefin complex followed by alpha-migratory insertion of CO and methanolysis of the resulting acyl palladiumintermediate. CuCl2 functions as the terminal oxidant in this palladium-catalyzed cyclization/carboalkoxylation
Platinum-Catalyzed Intramolecular Asymmetric Hydroarylation of Unactivated Alkenes with Indoles
作者:Xiaoqing Han、Ross A. Widenhoefer
DOI:10.1021/ol061441b
日期:2006.8.1
[reaction: see text] A 1:1 mixture of the platinum bis(phosphine) complex [(S)-4]PtCl2 [(S)-4 = (S)-3,5-t-Bu-4-MeO-MeOBIPHEP] catalyzes the intramolecular asymmetric hydroarylation of 2-(4-pentenyl)indoles in moderate to good yield with up to 90% ee.
Platinum-Catalyzed Intramolecular Alkylation of Indoles with Unactivated Olefins
作者:Cong Liu、Xiaoqing Han、Xiang Wang、Ross A. Widenhoefer
DOI:10.1021/ja031814t
日期:2004.3.1
Reaction of 1-methy-2-(4-pentenyl)indole (1) with a catalytic amount of PtCl2 (2 mol %) in dioxane that contained a trace of HCl (5 mol %) at 60 °C for 24 h led to the isolation of 4,9-dimethyl-2,3,4,9-tetrahydro-1H-carbazole (2) in 92% yield. Platinum-catalyzed cyclization of 2-(4-pentenyl)indoles tolerated substitution at each position of the 4-pentenyl chain. Furthermore, the protocol was applicable