Hypoiodite-catalysed oxidative homocoupling of arenols and tandem oxidation/cross-coupling of hydroquinones with arenes
作者:Muhammet Uyanik、Dai Nagata、Kazuaki Ishihara
DOI:10.1039/d1cc05171g
日期:——
We report the hypoiodite-catalyzed oxidative C–C homocoupling of arenols to biarenols or biquinones using aqueous hydrogen peroxide as an oxidant. In addition, by combining hypoiodite catalysis and lipophilic Lewis acid-assisted Brønsted acid catalysis under aqueous conditions, we achieved a tandem oxidation/cross-coupling reaction of hydroquinones with electron-rich arenes. These results highlight
Role of substituents on the reactivity and product selectivity in reactions of naphthalene derivatives catalyzed by the orphan thermostable cytochrome P450, CYP175A1
substrate selectivity of this enzyme, the biocatalytic activities of CYP175A1 on different substituted naphthalenes have been studied in oxidative pathway, and the effect of the substituent on the reaction has been determined. The enzyme first acts as a peroxygenase to convert these substituted naphthalenes to the corresponding naphthols, which subsequently undergo in-situ oxidative dimerization to form
A simple method for the direct synthesis of 2,2′-binaphthols 2 and dinaphtho[1,2-b;2′,1′-d]furans 3 under mild conditions was developed, utilizing a biaryl coupling reaction via electron donor–acceptor complexes of 1-naphthols with SnCl4. Heating of the complex in a sealed tube for (18–24 h) afforded the corresponding o–o coupled product 2 in excellent yield. Prolonged reaction (56–65 h) under the
利用电子供体-受体的联芳基偶联反应,开发了一种在温和条件下直接合成2,2'-联萘酚2和二萘并[1,2- b ; 2',1'- d ]呋喃3的简单方法1-萘酚与SnCl 4的配合物。该复合物在密封管中加热(18-24小时),得到相应的ö - ö偶联产物2的优良率。在相同条件下长时间反应(56–65小时)一步即可获得3的高收率。我们还发现,对于在C-1位上没有羟基以外的取代基的α-萘酚,区域选择性o –o进行了偶联反应。产物2a,2b和2g应该用作天然存在的3,3′-双juglone,3,3′-biplumbagin和艾力汀的合成中间体。
Oxidative Coupling of 1-Naphthols over Noble and Base Metal Catalysts
作者:Mabuatsela V. Maphoru、Josef Heveling、Sreejarani K. Pillai
DOI:10.1002/cplu.201300307
日期:2014.1
electron-donating substituents reacted. The corresponding binaphthalenyl diols can be considered as reaction intermediates. Yields of up to 99 % were obtained from 2-methyl-1-naphthol as the starting material within 20 minutes. Probably for steric reasons, the diol is the final product obtained from 2-ethyl-1-naphthol. For 4-methoxy-1-naphthol the outcome is determined by the reaction temperature. At 25 °C the