AuBr<sub>3</sub>-Catalyzed [4 + 2] Benzannulation between an Enynal Unit and Enol
作者:Naoki Asao、Haruo Aikawa、Yoshinori Yamamoto
DOI:10.1021/ja0477367
日期:2004.6.23
es, and carbonylcompounds 2 in the presence of a catalytic amount of AuBr3 in 1,4-dioxane at 100 degrees C gave the functionalized aromaticcompounds 3 in high yields. The AuBr3-catalyzed formal [4 + 2] benzannulation proceeds most probably through the coordination of the triple bond of 1 to AuBr3, the formation of a pyrylium auric ate complex via the nucleophilic addition of the carbonyl oxygen atom