Transition-Metal-Free and Chemoselective NaO<sup><i>t</i></sup>Bu–O<sub>2</sub>-Mediated Oxidative Cleavage Reactions of <i>vic</i>-1,2-Diols to Carboxylic Acids and Mechanistic Insight into the Reaction Pathways
作者:Sun Min Kim、Dong Wan Kim、Jung Woon Yang
DOI:10.1021/ol501012f
日期:2014.6.6
method for efficient oxidativecleavage of vic-1,2-diols using a NaOtBu–O2 system resulted in the formation of carboxylic acids in high yields. The present protocol is an eco-friendly alternative to a conventional transition-metal-based method. This new strategy allows large-scale production with nonchromatographic purification while also suppressing competitive reactionpathway such as benzilic acid
一种使用NaO t Bu–O 2系统对vic -1,2-二醇进行有效氧化裂解的方法,可高产率地形成羧酸。本协议是传统的基于过渡金属的方法的环保替代。这种新策略可以通过非色谱纯化进行大规模生产,同时还可以抑制竞争性反应途径,例如苯甲酸重排。
GLUCOSAMINE DERIVATIVES AND PHARMACEUTICAL USES THEREOF
申请人:RISEN (SUZHOU) PHARMA TECH CO., LTD.
公开号:US20190185502A1
公开(公告)日:2019-06-20
There are provided compounds of Formula (A) and pharmaceutically acceptable salts and esters thereof, and pharmaceutical compositions thereof, used for the prevention or treatment in a mammal of joint and bone disorders such as arthritis and osteoporosis.
Facile synthesis of 2-alkynyl oxazoles <i>via</i> a Ce(OTf)<sub>3</sub>-catalyzed cascade reaction of alkynyl carboxylic acids with <i>tert</i>-butyl isocyanide
作者:Ming Cao、Qing-Hu Teng、Zhi-Wei Xi、Li-Qiu Liu、Ren-Yong Gu、Ying-Chun Wang
DOI:10.1039/c9ob02337b
日期:——
We developed an efficient and novel protocol to synthesize 2-alkynyl oxazoles from tert-butyl isocyanide and alkynyl carboxylic acids. This method allowed the synthesis of diversely functionalized oxazoles under mild reaction conditions, coupled with operational simplicity and these functionalized oxazoles showed a certain degree of biological activity. Moreover, compounds 2b, 2h, 2k, 2n, 2p and 2t
Transformations of N-arylpropiolamides to indoline-2,3-diones and acids via C≡C triple bond oxidative cleavage and C(sp2)–H functionalization
作者:Ming-Bo Zhou、Yang Li、Xuan-Hui Ouyang、Jin-Heng Li
DOI:10.1007/s11426-019-9633-x
日期:2020.2
A new palladium-catalyzed oxidative conversion of N-arylpropiolamides and H2O to various indoline-2,3-diones and acids through the C≡C triple bond cleavage and C(sp2)–H functionalization is described, which is promoted by a cooperative action of catalytic CuBr2, 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) and O2. The method provides a practical tool for transformations of alkynes by means of a C–H
Reactivity of an Iron–Oxygen Oxidant Generated upon Oxidative Decarboxylation of Biomimetic Iron(II) α-Hydroxy Acid Complexes
作者:Sayantan Paria、Sayanti Chatterjee、Tapan Kanti Paine
DOI:10.1021/ic402443r
日期:2014.3.17
study the mechanism of dioxygen activation at the iron(II) centers. Single-crystal X-ray structural analyses of 1, 2, and 5 were performed to assess the binding mode of an α-hydroxy/methoxy acid anion to the iron(II) center. While the iron(II) α-methoxy acid complexes are unreactive toward dioxygen, the iron(II) α-hydroxy acid complexes undergo oxidative decarboxylation, implying the importance of the