Selective Synthesis of α‐Alkoxy Enones by α‐Addition of Alcohols to Alkynones Using 1,1,1,3,3,3‐Hexafluoroisopropanol and PPh
<sub>3</sub>
as Co‐catalysts
作者:Xiu‐Ming Li、Jing‐Kui Yang
DOI:10.1002/ejoc.202201163
日期:2022.12.19
The α-addition of alcohols to alkynones was demonstrated. A series of α-alkoxy enones can directly be synthesized in moderate to high yields under mild conditions. Mechanism studies were carried out by various means.
Palladium-catalyzed cross-coupling reaction of iodobenzene and its 4-substituted derivatives, except for 4-nitroiodobenzene, with (Z)-1-ethoxy-2-(tributylstannyl)ethene under a carbon monoxide atmosphere (5 atm) gave the corresponding (E)-3-ethoxy-1-arylprop-2-en-1-ones in considerable yields. Syntheses of chromone and 4(1H)-quinolinone were accomplished by application of this method to 2-(methoxymethoxy)iodobenzene and ethyl 2-iodophenylcarbanylate, respectively. The results obtained on the carbonylative coupling reaction of halopyridines are also described.