Indium-Mediated Regio- and Chemoselective Synthesis of α-Hydroxyalkyl Allenic Esters and Gold-Catalyzed Cyclizations to Ethyl 2-Naphthoate Derivatives
摘要:
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.
Copper(I)‐catalyzed Cyclization Reactions of Ethyl (
<i>E</i>
)‐α‐Ethynyl‐β‐Aryl‐α,β‐Unsaturated Esters with
<i>N</i>
‐Sulfonyl Azides: Synthesis of 1‐Aminonaphthalene, 3‐Aminobenzofuran, and 3‐Aminothiobenzofuran Derivatives
作者:Jeong‐Yu Son、Gi Uk Han、Gi Hoon Ko、Chanyoung Maeng、Seohyun Shin、Phil Ho Lee
DOI:10.1002/bkcs.11755
日期:2019.7
4‐(alkyl or arylsulfonamido)‐2‐naphthoates from ethyl (E)‐α‐ethynyl‐β‐aryl‐α,β‐unsaturated esters (1) and N‐sulfonyl azides (2) in the presence of 2,6‐lutidine in THF at 60 °C for 3 h was developed in one step, in which a copper(I)‐catalyzed 1,3‐dipolar cycloaddition, ketenimine formation, and 6π‐electrocyclization followed by [1,3]‐H shift tandem reaction took place. This method enabled efficient synthesis
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.
Copper-Catalyzed Intramolecular Hydroalkoxylation of α-(1-Hydroxy-1-alkyl- and -aryl)methylallenoates by a 5-<i>Endo</i> Mode for Preparation of 2-Alkyl- and 2-Aryl-2,5-dihydrofurans
作者:Sanghyuck Kim、Phil Ho Lee
DOI:10.1021/jo2018125
日期:2012.1.6
Ethyl alpha-(1-hydroxy-1-alkyl)methylallenoates and alpha-(1-hydroxy-1-aryl)methylallenoates containing not only electron-donating groups but also an electron-withdrawing group on the aryl group at the alpha-position have been shown to undergo an efficient and selective copper-catalyzed intramolecular hydroalkoxylation to give functionalized 3-ethoxycarbony1-2-alkyl- and -aryl-2,5-dihydrofurans in good to excellent yields through a 5-endo mode.