Stereoselective DABCO-Catalyzed Synthesis of (<i>E</i>)-α-Ethynyl-α,β-Unsaturated Esters from Allenyl Acetates
作者:Yongsik Choe、Phil Ho Lee
DOI:10.1021/ol9001703
日期:2009.3.19
(E)-alpha-Ethynyl-alpha,beta-unsaturated esters were exclusively prepared in good to excellent yields from treatment of allenyl acetates with 10 mol % DABCO in DMF at room temperature.
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.