One-pot straightforward approach to 2,3-disubstituted benzo/naphtho[b]furans via domino annulation of α-oxoketene dithioacetals and 1,4-benzo/naphthoquinone mediated by AlCl3 at room temperature
versatile and convenient one-pot direct approach to 2,3-disubstituted benzo/naphtho[b]furans via domino annulation of α-oxoketene dithioacetals and 1,4-benzo/naphthoquinone has been achieved in the presence of aluminium chloride at room temperature. This protocol represents an extremely simple, straightforward and rapid entry to highly substitutedbenzo/naphtho[b]furans in good yields from easily viable
在室温下存在氯化铝的情况下,通过α-氧杂环丁烯二硫缩醛和1,4-苯并/萘醌的多米诺环化反应,获得了一种通用且方便的一锅直接方法,用于2,3-二取代的苯并/萘并[ b ]呋喃。该方案代表了在温和的反应条件下,从容易生存的起始原料中以极高的收率非常容易,直接,迅速地进入高度取代的苯并/萘并[ b ]呋喃。
Pd-Catalyzed C–S Activation for [3 + 3] Annulation of 2-(Methylthio)benzofuran-3-carboxylates and 2-Hydroxyphenylboronic Acids: Synthesis of Coumestan Derivatives
作者:Jingxin Liu、Yingjie Liu、Wenting Du、Ying Dong、Jun Liu、Mang Wang
DOI:10.1021/jo400984h
日期:2013.7.19
Pd-catalytic C-S activation was successfully applied to initiate the cross-coupling of (2-methylthio-3-ester)benzofurans with 2-hydroxyphenylboronic acids and sequential intramolecular transesterification process under Liebeskind-Srogl conditions. Thus, a novel [3 + 3] annulation strategy for efficient synthesis of coumestan derivatives has been developed from readily available starting materials.