A Series of Two Oxidation Reactions of <i>ortho</i>-Alkenylbenzamide with Hypervalent Iodine(III): A Concise Entry into (3<i>R</i>,4<i>R</i>)-4-Hydroxymellein and (3<i>R</i>,4<i>R</i>)-4-Hydroxy-6-methoxymellein
作者:Takuya Takesue、Morifumi Fujita、Takashi Sugimura、Hiroki Akutsu
DOI:10.1021/ol502225p
日期:2014.9.5
A sequence of oxidation reactions of alkenamides with hypervalent iodine is described. Oxidation of ortho-alkenylbenzamide substrates selectively gave isochroman-1-imine products. The products underwent further oxidation in the presence of a Pd salt catalyst leading to regioselective C-H acetoxylation at the 8-position. A series of oxidations was applied to the crucial steps of asymmetric synthesis of 4-hydroxymellein derivatives.