Ru-Photoredox-Catalyzed Decarboxylative Oxygenation of Aliphatic Carboxylic Acids through <i>N</i>-(acyloxy)phthalimide
作者:Chao Zheng、Yuting Wang、Yangrui Xu、Zhen Chen、Guangying Chen、Steven H. Liang
DOI:10.1021/acs.orglett.8b01885
日期:2018.8.17
yl)oxyl (TEMPO) in the presence of rutheniumphotoredoxcatalysis is reported. The key transformation entails a highly efficient photoredox catalytic cycle using Hantzsch ester as a reductant. The ensuing alkoxyamine can be readily converted to the corresponding alcohol in one pot, representing an alternative approach to access aliphatic alcohols under photoredox conditions.
A General Method for Photocatalytic Decarboxylative Hydroxylation of Carboxylic Acids
作者:Shah Nawaz Khan、Muhammad Kashif Zaman、Ruining Li、Zhankui Sun
DOI:10.1021/acs.joc.0c00312
日期:2020.4.3
A general and practical method for decarboxylative hydroxylation of carboxylicacids was developed through visible light-induced photocatalysis using molecular oxygen as the green oxidant. The addition of NaBH4 to in situ reduce the unstable peroxyl radical intermediate much broadened the substrate scope. Different sp3 carbon-bearing carboxylicacids were successfully employed as substrates, including
manuscript reports a visible light-mediated organosul-fide catalysis that enables the decarboxylative coupling between simple aliphaticalcohol and tertiary or secondary alkyl carboxylic acid-derived redox active esters to produce a C(sp3)-O-C(sp3) fragment. Results of the coupling using other heteroatom nucleophiles such as water, amides and thiols are also described.
Use of the Koch-Haaf reaction in a new synthesis of gemfibrozil
作者:R. G. Glushkov、A. I. L'vov、O. S. Sizova、N. K. Davydova、I. A. Balashova、N. P. Solov'eva、O. S. Anisimova
DOI:10.1007/bf02219470
日期:1995.1
an alkene (III). In both cases, the reaction proceeds via an intermediate carbocation (IV) that forms in a highly acidic medium (98% H2SO4). Carbocation IV reacts with the carbonmonoxide generated from formic acid and transforms into carbocation V, whose hydrolysis facilitates the formation of acid I. We have shown that depending on the selected conditions, different compounds can be obtained in this
Koch-Haaf 反应(醇或烯烃与一氧化碳在强酸性介质中的羰基化反应)是一种众所周知且方便的在温和条件下合成叔羧酸的方法。然而,由于重排形成的中间碳正离子产生复杂产物的混合物,因此它未能找到对芳族化合物的青睐。只有 Takahashi 等人 [1] 描述了在 Koch-Haaf 反应条件下由相应的二芳基甲醇和二芳基乙醇制备二芳基乙酸和二芳基丙酸。我们研究了使用 Koch-Haaf 反应合成吉非贝齐 [2,2-二甲基-5-(2,5-二甲基苯氧基)戊酸] (I) 的可能性,这是一种用于预防和治疗动脉粥样硬化的有价值的药物。 2]。我们从醇 (II) 和烯烃 (III) 制备酸 I。在这两种情况下,反应都是通过在高酸性介质(98% H2SO4)中形成的中间碳正离子 (IV) 进行的。碳正离子 IV 与甲酸产生的一氧化碳反应并转化为碳正离子 V,其水解促进酸 I 的形成。我们已经表明,根据所选条