6-(2-Adamantan-2-ylidene-hydroxybenzoxazole)- O -sulfamate: A potent non-steroidal irreversible inhibitor of human steroid sulfatase
摘要:
We report the synthesis and results from the in vitro evaluation of 6-(adamantan-2-ylidene-hydroxybenzoxazole)-O-sulfamate 1 as an irreversible inhibitor of human steroid sulfatase (STS). Highly straightforward, condensation of 2-methyl-6-hydroxybenzoxazole with 2-adamantanone, subsequent elimination of water and sulfamoylation provide the title compound in 45% overall yield from the inexpensive 2,4-dihydroxyacetophenone. 1 was found to be a potent irreversible inhibitor of purified human steroid sulfatase (STS) and specific for this enzyme relative to human arylsulfatases A and B. In cellular assays with human keratinocytes, sebocytes and fibroblasts, 1 blocked STS activity with IC50 values in the range of 0.15-0.8 nM, and in MCF-7 breast cancer cells with IC50 = 2.3 nM, while it did not bind to estrogen receptors alpha and beta. Thus, 1 is a candidate for further investigation of its potential as a drug to be used in androgen- and estrogen-dependent diseases. (C) 2003 Elsevier Ltd. All rights reserved.
Modular Cyclopentenone Synthesis through the Catalytic Molecular Shuffling of Unsaturated Acid Chlorides and Alkynes
作者:Yong Ho Lee、Elliott H. Denton、Bill Morandi
DOI:10.1021/jacs.0c10832
日期:2020.12.16
general strategy for the intermolecular synthesis of polysubstituted cyclopentenones using palladium catalysis. Overall, this reaction is achieved via a molecular shuffling process involving an alkyne, an α,β-unsaturated acid chloride, which serves as both the alkene and carbon monoxide source, and a hydrosilane to create three new C-C bonds. This newcarbon monoxide-free pathway delivers the products
我们描述了使用钯催化分子间合成多取代环戊烯酮的一般策略。总体而言,该反应是通过涉及炔烃、α,β-不饱和酰氯(作为烯烃和一氧化碳来源)和氢硅烷的分子改组过程实现的,以产生三个新的 CC 键。这种新的无一氧化碳途径提供了具有优异产量的产品。此外,区域选择性是对环戊烯酮合成常规方法的补充。此外,还提出了一组区域和化学发散反应,以强调这种新策略的合成潜力。
Nickel-Catalyzed Decarboxylative Difluoroalkylation of α,β-Unsaturated Carboxylic Acids
作者:Gang Li、Tao Wang、Fan Fei、Yi-Ming Su、Yan Li、Quan Lan、Xi-Sheng Wang
DOI:10.1002/anie.201511321
日期:2016.3.1
The first example of nickel‐catalyzed decarboxylative fluoroalkylation of α,β‐unsaturated carboxylic acids has been developed with commonly available fluoroalkyl halides. This novel transformation has demonstrated broad substrate scope, excellent functional‐group tolerance, mild reaction conditions, and excellent stereoselectivity. Mechanistic investigations indicate that a fluoroalkyl radical is involved
Decarboxylative and Denitrative Trifluoromethylation for the Synthesis of C<sub>vinyl</sub>CF<sub>3</sub>Compounds with Togni (II) Reagent
作者:Jing-jing Ma、Wen-bin Yi、Guo-ping Lu、Chun Cai
DOI:10.1002/adsc.201500631
日期:2015.11.16
A highly efficient dimethylformamide (DMF)-promoted decarboxylativetrifluoromethylation of α,β-unsaturated carboxylic acids with Togni (II) reagent under metal-free conditions has been developed. The reactions showed good yields, high stereoselectivities and excellent functional group tolerance. Mechanistic studies confirmed that free-radical processes were involved in this system since the CF3 radical
Copper-Catalyzed Di- and Trifluoromethylation of α,β-Unsaturated Carboxylic Acids: A Protocol for Vinylic Fluoroalkylations
作者:Zhengbiao He、Tao Luo、Mingyou Hu、Yanjing Cao、Jinbo Hu
DOI:10.1002/anie.201200140
日期:2012.4.16
Dual action: The Lewis acid CuF2⋅2 H2O efficiently catalyzes the reaction between electrophilic fluoroalkylating agents and α,β‐unsaturated carboxylic acids by dually activating both reactants, thus affording di‐ and trifluoromethyl alkenes in high yields with excellent E/Z selectivity.
Benzoxa- and benzthiazoles substituted at the 2 position and carrying a sulfamic acid ester group bound via oxygen to the phenyl part of the ring structure, such as the compounds of formula (I) wherein the symbols have various significances, possess interesting pharmacological activity. They can be prepared by sulfamoylation of a corresponding compound carrying a hydroxy group on the phenyl part of the ring structure, or by N-substitution. They are indicated for use as steroid sulfatase inhibitors in the prevention and treatment of illnesses responsive to steroid sulfatase inhibition, such as acne.