from l‐ and d‐xylose, and l‐ and d‐arabinose, respectively. These monosaccharide‐based chiral macrocycles were tested as phase transfer catalysts in a few asymmetric reactions. The xylal‐based crown compounds proved to be efficient catalysts in a few liquid‐liquid phase reactions. The epoxidation of trans‐chalcone and the Darzens condensation of α‐chloroacetophenone with benzaldehyde took place with
Me<sub>3</sub>SI-promoted chemoselective deacetylation: a general and mild protocol
作者:Aakanksha Gurawa、Manoj Kumar、Sudhir Kashyap
DOI:10.1039/d1ra03209g
日期:——
Me3SI-mediated simple and efficient protocol for the chemoselective deprotection of acetyl groups has been developed via employing KMnO4 as an additive. This chemoselective deacetylation is amenable to a wide range of substrates, tolerating diverse and sensitive functional groups in carbohydrates, amino acids, natural products, heterocycles, and general scaffolds. The protocol is attractive because it uses
[EN] SUBSTITUTED THIOHYDANTOIN DERIVATIVES AS ANDROGEN RECEPTOR ANTAGONISTS<br/>[FR] UTILISATION DE DÉRIVÉS DE THIOHYDANTOIN SUBSTITUÉ EN TANT QU'ANTAGONISTES DES RÉCEPTEURS D'ANDROGÈNES
申请人:JANSSEN PHARMACEUTICA NV
公开号:WO2017123542A1
公开(公告)日:2017-07-20
Disclosed are compounds, compositions and methods for treating of disorders that are affected by the antagonism of one or more androgen receptor types. Such compounds are represented by Formula (I) as follows: Formula (I) wherein R1 and G are defined herein.
作者:Miao Liu、Zhao-Xiang Luo、Tian Li、De-Cai Xiong、Xin-Shan Ye
DOI:10.1021/acs.joc.1c01318
日期:2021.11.19
Carbohydrates play essential roles in various physiological and pathological processes. Trifluoromethylated compounds have wide applications in the field of medicinal chemistry. Herein, we report a practical and efficient trifluoromethylation of glycals by an electrochemical approach using CF3SO2Na as the trifluoromethyl source and MnBr2 as the redox mediator. A variety of trifluoromethylated glycals
碳水化合物在各种生理和病理过程中发挥着重要作用。三氟甲基化化合物在药物化学领域有着广泛的应用。在此,我们报道了一种使用CF 3 SO 2 Na 作为三氟甲基源和MnBr 2作为氧化还原介体的电化学方法对糖醛进行实用且有效的三氟甲基化。多种带有不同保护基团的三氟甲基化糖以 60-90% 的收率获得,具有高区域选择性。CF 3自由基的成功捕获表明该反应涉及自由基机理。
Sterically Hindered 2,4,6-Tri-<i>tert</i>-butylpyridinium Salts as Single Hydrogen Bond Donors for Highly Stereoselective Glycosylation Reactions of Glycals
作者:Titli Ghosh、Ananya Mukherji、Pavan K. Kancharla
DOI:10.1021/acs.orglett.9b00626
日期:2019.5.17
We demonstrate here that the strained and bulky protonated 2,4,6-tri-tert-butylpyridine salts serve as efficient catalysts for highlystereoselectiveglycosylations of various glycals. Moreover, the mechanism of action involves an interesting single hydrogen bond mediated protonation of glycals and not via the generally conceived Brønsted acid pathway. The counteranions also play a role in the outcome