Sulfonylated aminothiazoles as new small molecule inhibitors of protein phosphatases
摘要:
Based on a previously identified lead structure, SC-alpha alpha delta9, we have developed a versatile new chemical scaffold that can be readily modified to generate libraries of both Tyr and dual specificity phosphatase inhibitors with reduced molecular weight and lipophilicity. The most potent analogue identified to dare, aminothiazole 8z, inhibits the dual specificity phosphatase Cdc25B with a K-i of 4.6 +/- 0.4 muM and a Hill coefficient of 2. (C) 2001 Elsevier Science Ltd. Ail rights reserved.
The effects of phosphorus substituents on the reactivity of α‐alkoxyphosphonium salts with nucleophiles has been explored. Reactions of α‐alkoxyphosphonium salts, prepared from various acetals and tris(o‐tolyl)phosphine, with a variety of nucleophiles proceeded efficiently. These processes represent the first examples of high‐yielding nucleophilic substitution reactions of α‐alkoxyphosphonium salts
Retracted: The Manganese(I)‐Catalyzed Asymmetric Transfer Hydrogenation of Ketones: Disclosing the Macrocylic Privilege
作者:Alessandro Passera、Antonio Mezzetti
DOI:10.1002/anie.201912605
日期:2020.1.2
The bis(carbonyl) manganese(I) complex [Mn(CO)2 (1)]Br (2) with a chiral (NH)2 P2 macrocyclic ligand (1) catalyzes the asymmetrictransferhydrogenation of polar double bonds with 2-propanol as the hydrogen source. Ketones (43 substrates) are reduced to alcohols in high yields (up to >99 %) and with excellent enantioselectivities (90-99 % ee). A stereochemical model based on attractive CH-π interactions
Controlling the selectivity and efficiency of the hydrogen borrowing reaction by switching between rhodium and iridium catalysts
作者:Danfeng Wang、Roy T. McBurney、Indrek Pernik、Barbara A. Messerle
DOI:10.1039/c9dt02819f
日期:——
forming new carbon–carbon bonds. However, this transformation can result in more than one product being formed. The work reported here utilises bidentate triazole-carbene ligated iridium and rhodium complexes as catalysts for the selectiveformation of alkylated ketone or alcohol products. Switching from an iridium centre to a rhodium centre in the complex resulted in significant changes in product selectivity
An unusual and novel reaction of alpha-alkoxyphosphonium salts, generated from O,O-acetals and Ph(3)P, with Grignard reagents under an O(2) atmosphere afforded alcohols in moderate to high yields. It was clarified by isotopic labelling experiments that the reaction proceeded via a novel radical pathway.
Determining the Enantiomeric Excess and Absolute Configuration of <i>In Situ</i> Fluorine-Labeled Amines and Alcohols by <sup>19</sup>F NMR Spectroscopy
作者:Sumin Jang、Hahyoun Park、Quynh Huong Duong、Eun-Jeong Kwahk、Hyunwoo Kim
DOI:10.1021/acs.analchem.1c04834
日期:2022.1.18
The determination of the enantiomericexcess and absolute configuration of chiral compounds is indispensable in synthetic, pharmaceutical, and biological chemistry. In this article, we describe an efficient 19F nuclear magnetic resonance (NMR)-based analytical protocol for determining the enantiomericexcess and absolute configuration of in situ fluorine-labeled amines and alcohols. 2-Fluorobenzoylation
手性化合物的对映体过量和绝对构型的测定在合成、药物和生物化学中是必不可少的。在本文中,我们描述了一种有效的基于19 F 核磁共振 (NMR) 的分析协议,用于确定原位氟标记的胺和醇的对映体过量和绝对构型。2-氟苯甲酰化用于将分析物转化为氟化酰胺或酯。将得到的 F 标记分析物与阳离子钴 (III) 络合物 [Co]BArF 混合,在19 F 1 H} NMR 光谱中得到分析物对映异构体的清晰基线峰分离。测得的 Δδ RS符号被明确地用于关联胺、氨基醇和醇的绝对构型。此外,结构相关的19 F 1 H} NMR 信号通过使用 [Co]BArF 和ent -[Co]BArF分析对映体纯分析物样品的相对化学位移,能够确定绝对构型。