Reactions of Difluorocarbene with Organozinc Reagents
作者:Vitalij V. Levin、Artem A. Zemtsov、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1021/ol400122k
日期:2013.2.15
Reactions of difluorocarbene with benzyl and alkylzinc halides leading to fluorinated organozinc species have been described. The generated α-difluorinated organozinc reagents are reasonably stable in solution and can be quenched with external electrophiles (iodine, bromine, proton), affording compounds containing the CF2 fragment.
Anodic benzylic C(sp<sup>3</sup>)–H amination: unified access to pyrrolidines and piperidines
作者:Sebastian Herold、Daniel Bafaluy、Kilian Muñiz
DOI:10.1039/c8gc01411f
日期:——
important heterocyclic motifs of pyrrolidines and piperidines within a uniform reaction protocol. The mechanism of this unprecedented C–H amination strategy involves anodic C–H activation to generate a benzylic cation, which is efficiently trapped by a nitrogen nucleophile. The applicability of the process is demonstrated for 40 examples comprising both 5- and 6-membered ring formations.
Nuclear Versus Side-Chain Bromination of 4-Methoxy Toluene by an Electrochemical Method
作者:K. Kulangiappar、M. Anbukulandainathan、T. Raju
DOI:10.1080/00397911.2014.905599
日期:2014.9.2
Abstract The electrochemical bromination of 4-methoxy toluene by two-phase electrolysis yields 3-bromo 4-methoxy toluene at first, which subsequently undergoes side-chain bromination to give 3-bromo 4-methoxy benzyl bromide as a final product in 86% yield. The two-phase electrolysis consists of 25–50% NaBr as aqueous electrolyte and CHCl3 containing aromatic compound as organic phase. The reaction
Asymmetric Phase-Transfer Catalyzed Glycolate Alkylation, Investigation of the Scope, and Application to the Synthesis of (−)-Ragaglitazar
作者:Merritt B. Andrus、Erik J. Hicken、Jeffrey C. Stephens、D. Karl Bedke
DOI:10.1021/jo051568z
日期:2005.11.1
Asymmetric glycolate alkylation using a protected acetophenone surrogate under solid−liquid phase-transfer conditions is a new approach to the synthesis of 2-hydroxy esters and acids. Diphenylmethyloxy-2,5-dimethoxyacetophenone 1 with a trifluorobenzyl cinchonidinium bromide catalyst 9 (10 mol %) and cesium hydroxide provided S-alkylation products 2 at −35 °C in high yield (80−99%) and with excellent
This invention relates to 2-substituted-imidazo[4,5 -c]pyridines, to the process for their preparation, to pharmaceutical compositions containing said 2-substituted-imidazo]4,5-c]pyridines and to the use of said 2-substituted-imidazo[4,5-c]pyridines for modifying the balance between bone production and bone resorption in a host animal, including man.