The Reaction of 2-Acetyl-1,4-benzoquinone with Alcohols. A Convenient Synthesis of 2-Acetyl-3-alkoxy-1,4-benzoquinones
作者:F. FARIÑA、J. VALDERRAMA
DOI:10.1055/s-1971-35036
日期:——
Copper-catalysed oxidative alkoxylation of acyl- and carbomethoxy-hydroquinones
作者:Patrice Capdevielle、Michel Maumy
DOI:10.1016/s0040-4020(00)00947-9
日期:2001.1
Oxidation of title hydroquinones by an [O-2/(CuCl)-Cl-I] system in the presence of alcohols yields (71-88%) corresponding regioselectively 3-alkoxylated compounds. Compared with the classical procedure (silver oxide oxidation) in which alcohols have to be added to intermediate quinones in a second step, leading to a 1:1 mixture of starting material and final quinones, this new selective one-pot system does not oxidize alcohols and regenerates intermediate quinones from starting hydroquinones. Moreover, in situ trapping of the unstable formyl-quinone now allows the preparation of its 3-alkoxy derivative. (C) 2000 Elsevier Science Ltd. All rights reserved.
396. The synthesis of 5-hydroxy-8-methoxyflavone (primetin monomethyl ether)