经由各自的酰氯的脱卤化氢,分别原位产生氟代烯,二氟代烯,甲基氟代烯,三氟甲基氟代烯和苯基氟代烯。在存在环戊二烯的情况下,除了二氟乙烯烯外,均获得了[2 + 2]加合物。在不存在环戊二烯的情况下,低温19 F nmr指示存在烯酮的潜在前体酰基铵盐和烯醇化物,但无法明确检测到实际的烯酮物种。立体化学结果与目前公认的基于乙烯的环烯加成中立体化学测定的基于机理的机理基本一致。
<i>N</i>-Ammonium Ylide Mediators for Electrochemical C–H Oxidation
作者:Masato Saito、Yu Kawamata、Michael Meanwell、Rafael Navratil、Debora Chiodi、Ethan Carlson、Pengfei Hu、Longrui Chen、Sagar Udyavara、Cian Kingston、Mayank Tanwar、Sameer Tyagi、Bruce P. McKillican、Moses G. Gichinga、Michael A. Schmidt、Martin D. Eastgate、Massimiliano Lamberto、Chi He、Tianhua Tang、Christian A. Malapit、Matthew S. Sigman、Shelley D. Minteer、Matthew Neurock、Phil S. Baran
DOI:10.1021/jacs.1c03780
日期:2021.5.26
taking a first-principles approach guided by computation, these new mediators were identified and rapidly expanded into a library using ubiquitous buildingblocks and trivial synthesis techniques. The ylide-based approach to C–H oxidation exhibits tunable selectivity that is often exclusive to this class of oxidants and can be applied to real-world problems in the agricultural and pharmaceutical sectors
The present invention related to compounds of Formula (I) or an agronomically acceptable salt thereof, wherein Q, R2, R3, R4 and R5 are as described herein. The invention further relates to compositions comprising said compounds, to methods of controlling weeds using said compositions, and to the use of Compounds of Formula (I) as a herbicide.
[EN] PROCESS FOR PREPARATION OF LACTONE DERIVATIVES AND INTERMEDIATES THEREOF<br/>[FR] PROCÉDÉ DE PRÉPARATION DE DÉRIVÉS DE LACTONE ET DE SES INTERMÉDIAIRES
申请人:PHARMARESOURCES SHANGHAI CO LTD
公开号:WO2018032356A1
公开(公告)日:2018-02-22
A novel process for the preparation of lactone derivatives, and intermediates thereof is described. The lactone derivatives are important precursors for the synthesis of anti-hepatitis C virus agents, including sofosbuvir.
Synthesis of Optically Active (2-Fluoroacyl)benzenes
作者:Elke Fritz-Langhals
DOI:10.1055/s-1999-2921
日期:1999.11
Optically active (2-fluoroacyl)benzenes 1 which form a new class of compounds can be easily prepared from optically active 2-fluorocarboxylic acid chlorides 2 in high optical yield via Friedel-Crafts reaction using anhydrous iron trichloride as catalyst.
[EN] PROCESS FOR THE PREPARATION OF A FLUOROLACTON DERIVATIVE<br/>[FR] PROCÉDÉ DE PRÉPARATION D'UN DÉRIVÉ DE FLUOROLACTONE
申请人:HOFFMANN LA ROCHE
公开号:WO2014108525A1
公开(公告)日:2014-07-17
A novel process for the preparation of a fluorolactone derivative of the formula (I) and of its acylated derivative of formula (V) wherein R1 stands for a hydroxy protecting group is described. The acylated fluorolactones of formula (V), particularly the benzoyl derivative with R1 =benzyl are important precursors for the synthesis of prodrug compounds which have the potential to be potent inhibitors of the Hepatitis C Virus (HCV) NS5B polymerase.