Umpolung Difunctionalization of Carbonyls via Visible-Light Photoredox Catalytic Radical-Carbanion Relay
作者:Shun Wang、Bei-Yi Cheng、Matea Sršen、Burkhard König
DOI:10.1021/jacs.0c00629
日期:2020.4.22
catalysis with the Wolff–Kishner (WK) reaction allows the difunctionalization of carbonyl groups by a radical-carbanion relay sequence (photo-Wolff–Kishner reaction). Photoredox initiated radical addition to N-sulfonylhydrazones yields α-functionalized carbanions following the WK-type mechanism. With sulfur-centered radicals, the carbanions are further functionalized by reaction with electrophiles
[EN] METHODS OF SYNTHESIS OF INGENOL AND INTERMEDIATES THEREOF<br/>[FR] PROCÉDÉS DE SYNTHÈSE D'INGÉNOL ET DE SES INTERMÉDIAIRES
申请人:LEO LAB LTD
公开号:WO2014191457A1
公开(公告)日:2014-12-04
The present invention relates generally to methods of synthesis of diterpene heterocylic compounds. More particularly, the present invention relates to efficient methods of synthesis of ingenol (Formula (21), CAS 30220-46-3), from a compound of formula (1). The present invention also provides for various advantageous intermediates along the synthetic route of ingenol. Efficient synthesis of ingenol is important in the design and synthesis of related analogues, such as ingenol-3-angelate.
Oxidative conversion of β-hydroxyselenides to epoxides and ketones with meta-chloroperbenzoic acid
作者:Sakae Uemura、Kouichi Ohe、Nobuyuki Sugita
DOI:10.1039/c39880000111
日期:——
Treatment of β-hydroxy-primary-alkyl and β-hydroxy-β-phenyl-primary-alkyl selenides with 3–5 equiv. of meta-chloroperbenzoicacid in methanol or tetrahydrofuran gives the corresponding epoxides and phenyl migrated ketones, respectively, in high yields.
Nanosized gold-catalyzed selective oxidation of alkyl-substituted benzenes and n-alkanes
作者:Ankush V. Biradar、Tewodros Asefa
DOI:10.1016/j.apcata.2012.05.029
日期:2012.9
silica-supported gold nanoparticles efficiently catalyzed the oxidation reactions of different alkyl-substituted benzenes and linear alkanes with t-butyl hydroperoxide (TBHP) as an oxidant. The catalytic reactions gave up to ∼99% reactant conversion and up to ∼100% selectivity toward ketone products in some cases. This high selectivity toward ketone products by the catalysts was unprecedented, especially
Organoruthenium‐Supported Polyoxotungstate – Synthesis, Structure and Oxidation of
<i>n</i>
‐Hexadecane with Air
作者:Rui‐Qi Meng、Bin Wang、Hui‐Min Sui、Bao Li、Wei Song、Li‐Xin Wu、Bing Zhao、Li‐Hua Bi
DOI:10.1002/ejic.201201037
日期:2013.4
sandwich-type structure, which is further connected by K cations to construct the 3D structures. Based on complex Ru-KNa, the compound Ru-Na was synthesized, and it consists of two Ru(C6H6)} units linked to a [W8O28(OH)2]10– fragment by three Ru–O(W) bonds to result in an assembly with idealized C2 symmetry in which the polyanions form 3D structures by the connection of Na chains. Subsequently, the compound Ru-Na
钌配合物 KNa[Ru2(C6H6)2(CH3COO)6] (Ru-KNa) 及其多氧钨酸盐衍生物 Na6[Ru(C6H6)}2W8O28(OH)2]·16H2O (Ru-Na)成功地从常规合成反应中分离出来,并通过 X 射线单晶结构分析、红外光谱和元素分析进行表征。Ru-KNa 的一个显着方面是它有两种配体类型,苯和乙酸盐,乙酸盐配体仅通过一个中心 Na 阳离子连接形成二聚体夹心型结构,该结构通过 K 阳离子进一步连接以构建3D 结构。以络合物Ru-KNa为基础,合成了化合物Ru-Na,它由两个 Ru(C6H6)} 单元组成,通过三个 Ru-O(W) 键连接到 [W8O28(OH)2]10– 片段,从而形成具有理想化 C2 对称性的组件,其中聚阴离子形成 3D 结构通过 Na 链的连接。随后,将化合物 Ru-Na 锚定在(3-氨基丙基)三乙氧基硅烷(apts)改性的 SBA-15