Hypervalent iodine(III)/Et4N+Br− combination in water for green and racemization-free aqueous oxidation of alcohols
摘要:
We have found that the use of the Phl(OAc)(2)/Et4N+Br combination in water can significantly enhance its oxidation ability and oxidize a wide range of alcohols 1 to carbonyl compounds 2 in good to excellent yields. This clean aqueous oxidation method shows no detectable racemization processes, and even an enolizable ketone 2m Could be obtained in an optically pure form from the corresponding chiral alcohol 1m. Utilization of the recyclable reagent 3 as a more practical alternative to Phl(OAc)(2) is also Successful in these reactions. (C) 2009 Elsevier Ltd. All rights reserved.
An excellent dual recycling strategy for the hypervalent iodine/nitroxyl radical mediated selective oxidation of alcohols to aldehydes and ketones
作者:Toshifumi Dohi、Kei-ichiro Fukushima、Tohru Kamitanaka、Koji Morimoto、Naoko Takenaga、Yasuyuki Kita
DOI:10.1039/c2gc16632a
日期:——
Using a recyclablehypervalentiodinereagent 1, the authors have constructed versatile and green methods for the hypervalentiodine and nitroxyl radical-mediated selective oxidation of alcohols to aldehydes and ketones. The recyclablereagent 1 having a unique tetraphenyladamantane structure exhibited almost the same reactivity as the ordinary reagent, phenyliodine diacetate (PIDA), in the hypervalent
Clean Synthesis of <i>N</i>-Pyrrolyl Azoles by Metal-Free Oxidative Cross-Coupling Using Recyclable Hypervalent Iodine Reagent
作者:Koji Morimoto、Ryosuke Ogawa、Daichi Koseki、Yusuke Takahashi、Toshifumi Dohi、Yasuyuki Kita
DOI:10.1248/cpb.c15-00469
日期:——
The facile and clean oxidative coupling reaction of pyrroles with azoles has been achieved using the recyclable hypervalentiodine(III) reagents having adamantane structures. These iodine(III) reagents could be recovered from the reaction mixtures by a simple solid-liquid separation, i.e., filtration, for reuse.
A Facile and Clean Direct Cyanation of Heteroaromatic Compounds Using a Recyclable Hypervalent Iodine(III) Reagent
作者:Toshifumi Dohi、Koji Morimoto、Naoko Takenaga、Akinobu Maruyama、Yasuyuki Kita
DOI:10.1248/cpb.54.1608
日期:——
The facile and clean direct cyanating reaction of pyrroles and thiophenes has been achieved using a recyclable hypervalent iodine(III) reagent 1b by a simple solid-liquid separation of the products and the reagent.
Clean and Direct Synthesis of .ALPHA.,.ALPHA.'-Bithiophenes and Bipyrroles by Metal-Free Oxidative Coupling Using Recyclable Hypervalent Iodine(III) Reagents
作者:Toshifumi Dohi、Koji Morimoto、Chieko Ogawa、Hiromichi Fujioka、Yasuyuki Kita
DOI:10.1248/cpb.57.710
日期:——
The facile and clean oxidative biaryl coupling reaction of thiophenes and pyrroles has been achieved using the recyclable hypervalent iodine(III) reagents having adamantane or methane structures. These iodine(III) reagents could be recovered from the reaction mixtures by a simple solid-liquid separation, i.e., filtration.
A heterocycle-containing aromatic compound represented by the formula: A-B, and an electrically conductive polymer obtained by oxidative polymerization of the heterocycle-containing aromatic compound as a monomer are provided. In the above formula, A represents a substituted or unsubstituted thiophene ring group, or a substituted or unsubstituted pyrrole ring group; B represents a substituted or unsubstituted hydrocarbon aromatic ring group, a substituted or unsubstituted thiophene ring group, or a substituted or unsubstituted pyrrole ring group; the ring represented by A and the ring represented by B are directly linked; however, A and B represent structures that are different from each other. The compound can be produced by a coupling reaction using a hypervalent iodine reactant.