以 1-羟基-2,2,6,6-四甲基哌啶 (TEMPOH) 为代表的羟胺作为活性物质广泛参与各种化学和电化学氧化。TEMPOH 的电化学行为对于理解 TEMPO 介导的氧化还原序列的机制至关重要。然而,与对水溶液中 TEMPOH 电化学的大量研究相比,其氧化电位E ox的唯一值据报道,有机溶液中的 (TEMPOH) 为 0.7 V(相对于乙腈中的 Fc),这似乎与实验观察到的 TEMPOH 容易氧化相矛盾。在此,重新研究了 TEMPOH 衍生物在乙腈中的电化学,其氧化电位(约 0 V)比文献中的小得多。酸/碱效应和动力学研究为这些新值提供了可信度。这种 0.7 V 的能量差异促使我们重新审视从旧值推导出的 TEMPOH 的热力学性质和氧化机制。
Efficient C(sp3)–H Bond Functionalization of Isochroman by AZADOL Catalysis
摘要:
A novel organocatalytic C(sp(3))-H bond functionalization of isochroman under practical conditions has been developed. In the presence of 5.0 mol % of AZADOL, the catalysis proceeded successfully with a broad range of substrates and nucleophiles in excellent yields.
The oxidative conversion of silylenolethers to α,β-unsaturated ketones using a less-hindered class of oxoammonium salts (AZADO+BF4–) is described. The reaction proceeds via the ene-like addition of oxoammonium salts to silylenolethers.
[EN] SELECTIVE C-O BOND CLEAVAGE OF OXIDIZED LIGNIN AND LIGNIN-TYPE MATERIALS INTO SIMPLE AROMATIC COMPOUNDS<br/>[FR] COUPURE SÉLECTIVE DE LIAISON C-O DE LIGNINE OXYDÉE ET DE SUBSTANCES DE TYPE LIGNINE EN COMPOSÉS AROMATIQUES SIMPLES
申请人:WISCONSIN ALUMNI RES FOUND
公开号:WO2015138563A1
公开(公告)日:2015-09-17
A method to cleave C-C and C-0 bonds in β-Ο-4 linkages in lignin or lignin sub-units is described. The method includes oxidizing at least a portion of secondary benzylic alcohol groups in β-Ο-4 linkages in the lignin or lignin sub-unit to corresponding ketones and then leaving C-0 or C-C bonds in the oxidized lignin or lignin sub-unit by reacting it with an organic carboxylic acid, a salt of an organic carboxylic acids, and/or an ester of an organic carboxylic acids. The method may utilize a metal or metal-containing reagent or proceed without the metal or metal-containing reagent.
A process for preparing 3-[(S)-7-bromo-2-(2-oxo-propylamino)-5-pyridin-2-yl-3H-1,4,-benzodiazepin-3-yl]propionic acid methyl ester at a high conversion rate with good reproducibility by oxidizing 3-[(S)-7-bromo-2-(2-hydroxy-propylamino)-5-pyridin-2-yl-3H-benzo[e][1,4]diazepin-3-yl]propionic acid methyl ester in the presence of an oxidation catalyst is provided by defining the ammonium ion content of 3-[(S)-7-bromo-2-(2-hydroxy-propylamino)-5-pyridin-2-yl-3H-benzo[e][1,4]diazepin-3-yl]propionic acid methyl ester.
申请人:THE RESEARCH FOUNDATION FOR THE STATE UNIVERSITY OF NEW YORK
公开号:US20170320893A1
公开(公告)日:2017-11-09
Described herein is a process for the total synthesis of macrolactones and macrolactams of formula I
including E- and Z-configuration thereof, in particular, nannocystins.
作者:Diana A. Iovan、Alexandra T. Wrobel、Arthur A. McClelland、Austin B. Scharf、Guy A. Edouard、Theodore A. Betley
DOI:10.1039/c7cc05014c
日期:——
We report the isolation of a room temperature stable dipyrromethene Cu(O2) complex featuring a side-on O2 coordination. Reactivity studies highlight the unique ability of the dioxygen adduct for both hydrogen-atom abstraction and acid/base chemistry towards phenols, demonstrating that side-on superoxide species can be reactive entities.