Copper-Mediated Trifluoromethylation of α-Diazo Esters with TMSCF<sub>3</sub>: The Important Role of Water as a Promoter
作者:Mingyou Hu、Chuanfa Ni、Jinbo Hu
DOI:10.1021/ja307058c
日期:2012.9.19
Copper-mediatedtrifluoromethylation of α-diazo esters with TMSCF(3) reagent has been developed as a new method to prepare α-trifluoromethyl esters. This trifluoromethylation reaction represents the first example of fluoroalkylation of a non-fluorinated carbene precursor. Water plays an important role in promoting the reaction by activating the "CuCF(3)" species prepared from CuI/TMSCF(3)/CsF (1.0:1
Propargyl α-aryl-α-diazoacetates as robust reagents for the effective C H bond functionalization of 1,3-diketones via scandium catalysis
作者:Balu S. Navale、Debasish Laha、Ramakrishna G. Bhat
DOI:10.1016/j.tetlet.2019.06.026
日期:2019.7
Propargyl alpha-aryl-alpha-diazoacetate a new class of reagent is developed for the effective C-H bond functionalization of 1,3-diketones at room temperature. The combination of scandium triflate and propargyl alpha-aryl-alpha-diazoacetate proved to be efficient catalyst-reagent system for the controlled C-H bond functionalization to afford 1,3-dicarbonyl alkylation. The protocol uses inexpensive Sc(OTf)(3) (5 mol%) and the reaction did not require the use of expensive catalysts or ligands and worked efficiently at room temperature. The practicality of the protocol has been demonstrated by the gram scale synthesis. (C) 2019 Elsevier Ltd. All rights reserved.
Identification of a new series of non-peptidic NK3 receptor antagonists
作者:Karsten Juhl、Tore Hansen、Jan Kehler、Nikolay A. Khanzhin、Morten B. Nørgaard、Thomas Ruhland、Dorrit B. Larsen、Klaus G. Jensen、Björn Steiniger-Brach、Søren M. Nielsen、Klaus B. Simonsen
DOI:10.1016/j.bmcl.2010.12.135
日期:2011.3
The identification and structure-activity relationships of 2-aminomethyl-1-aryl cyclopropane carboxamides as novel NK3 receptor antagonists are reported. The compound series was optimized to give analogues with low nanomolar binding to the NK3 receptor and brain exposure, leading to activity in vivo in the senktide-induced hypoactivity model in gerbils. (C) 2011 Elsevier Ltd. All rights reserved.
Ruthenium Catalyzed Directing Group-Free C2-Selective Carbenoid Functionalization of Indoles by α-Aryldiazoesters
作者:Wai-Wing Chan、Shing-Hin Yeung、Zhongyuan Zhou、Albert S. C. Chan、Wing-Yiu Yu
DOI:10.1021/ol9028226
日期:2010.2.5
A directing group-free approach for C2-selective carbenoid functionalization of NH-indoles is presented. Using [RuCl2(p-cymene)](2) as catalyst and alpha-aryldiazoesters as carbenoid source, 2-alkylated indoles were obtained in up to 96% isolated yield. Similarly, a regioselective carbenoid functionalization of NH-pyrroles was also achieved.