Synthesis of Naphthalenes via Platinum-Catalyzed Hydroarylation of Aryl Enynes
作者:Dongjin Kang、Jinsik Kim、Susung Oh、Phil Ho Lee
DOI:10.1021/ol302437v
日期:2012.11.16
An efficient synthetic method of functionalized naphthalenes having hydrogen, alkyl, alkenyl, aryl, or heteroaryl groups on the 4-position and ethoxycarbonyl group on the 2-position was developed through selective Pt-catalyzed 6-endo intramolecular hydroarylation of ethyl (E)-2-ethynyl/alkynyl cinnamates.
dirhodium complex Rh2(esp)2, α-diazo dibenzothiophenium salts generate highly electrophilic Rh-coordinated carbenes, which evolve differently depending on their substitution pattern. Keto-moieties directly attached to the azomethinic carbon promote carbene insertion into one of the adjacent C–S bonds, giving rise to highly electrophilic dibenzothiopyrilium salts. This intramolecular pathway is not operative
Indium-Mediated Regio- and Chemoselective Synthesis of α-Hydroxyalkyl Allenic Esters and Gold-Catalyzed Cyclizations to Ethyl 2-Naphthoate Derivatives
作者:Chansoo Park、Phil Ho Lee
DOI:10.1021/ol801196g
日期:2008.8.7
The regio- and chemoselective synthetic method of functionalized alpha-hydroxyalkyl allenic esters was developed from the reactions of various aldehydes with organoindium reagent generated in situ from indium and ethyl 4-bromobutynoate. The alpha-hydroxyalkyl allenic esters possessing electron-donating groups were cyclized to ethyl 2-naphthoate derivatives through intramolecular C-alkylation catalyzed by gold salts.
Synthesis of 2-Alkyl- and Aryl-3-ethoxycarbonyl-2,5-dihydrofurans through Gold-Catalyzed Intramolecular Hydroalkoxylation
作者:Dahan Eom、Dongjin Kang、Phil Ho Lee
DOI:10.1021/jo101474s
日期:2010.11.5
Treatment of a wide range of functionalized hydroxyallenic esters with 5 mol % Ph3PAuCl and 5 mol % AgOTf in CH2Cl2 at 25 degrees C for l h produced selectively 2-alkyl- and aryl-3-ethoxycarbony1-2,5-dihydrofurans in good to excellent yield through intramolecular hydroalkoxylation by a 5-endo mode.
Mukerjee, Y. N.; Gaur, S. P.; Jain, P. C., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1985, vol. 24, p. 985 - 987
作者:Mukerjee, Y. N.、Gaur, S. P.、Jain, P. C.、Anand, Nitya