Air- and Light-Stable <i>S</i>-(Difluoromethyl)sulfonium Salts: <i>C</i>-Selective Electrophilic Difluoromethylation of β-Ketoesters and Malonates
作者:Sheng-Le Lu、Xin Li、Wen-Bing Qin、Jian-Jian Liu、Yi-Yong Huang、Henry N. C. Wong、Guo-Kai Liu
DOI:10.1021/acs.orglett.8b03067
日期:2018.11.2
Air- and light-stable electrophilic difluoromethylating reagents, S-(difluoromethyl)-S-phenyl-S-(2,4,6-trialkoxyphenyl) sulfonium salts were successfully developed, and the introduction of intramolecular hydrogen bonds plays a crucial role for the stabilities and reactivities of these reagents. C-selective difluoromethylation of a broad range of β-ketoesters and malonates proceeded smoothly under mild
Methyl 3-oxo-ω-fluorosulfonylperfluoropentanoate: a versatile trifluoromethylating agent for organic halides
作者:Qing-Yun Chen、Jian-Xing Duan
DOI:10.1039/c39930001389
日期:——
Methyl 3-oxo-ω-fluorosulfonylperfluoropentanoate FSO2CF2CF2OCF2CO2Me 1, prepared through the reaction of readily available ICF2CF2OCF2CF2SO2F and SO3 followed by MeOH, is a very convenient trifluoromethylatingagent; in the presence of copper(I) iodide, 1not only reacts with vinyl, benzyl allyl, phenyl iodides and bromides, but also with aryl chlorides to give the corresponding trifluoromethyl compounds
3-氧-ω-氟磺酰基全氟戊酸甲酯FSO 2 CF 2 CF 2 OCF 2 CO 2 Me 1是通过容易获得的ICF 2 CF 2 OCF 2 CF 2 SO 2 F和SO 3然后与MeOH反应制备的,非常方便三氟甲基化剂;在碘化铜(I)存在下,1不仅与乙烯基,苄基烯丙基,苯基碘化物和溴化物反应,而且与芳基氯化物反应,以中等至高收率得到相应的三氟甲基化合物;提出了可能的反应机理。
Synthetic and mechanistic aspects of halo-F-methylphosphonates
作者:Richard M. Flynn、Donald J. Burton
DOI:10.1016/j.jfluchem.2011.05.034
日期:2011.10
The synthesis of a variety of new halo-F-methylphosphonates has been achieved by a Michaelis–Arbuzov type reaction between a halo-F-methane and a trialkyl phosphite. This synthesis has proved to be of wide scope and utility for the high yield preparation of a number of heretofore unknown compounds. The 1H, 19F, 13C and 31P NMR spectroscopic properties are reported in detail. The mechanism for the formation
Bis(trifluoromethyl)cadmium·glyme (glyme = dimethoxyethane), a new, powerful fluoroalkylating agent and low-temperature source of difluorocarbene
作者:Larry J. Krause、John A. Morrison
DOI:10.1039/c39800000671
日期:——
The newly isolated reagent (CF3)2Cd·glyme [glyme =(MeOCH2)2] readily exchanges ligands with, e.g., GeI4, SnI4, or PI3 to form the fully substituted compounds (CF3)4Ge, (CF3)4Sn, or (CF3)3P, within minutes at ambient temperature; reactions with acyl halides, like MeC(O)Br, form the acyl fluorides, like MeC(O)F, in excellent yields, 95%, at –25 °C and extrusion of CF2 at –25 °C in this reaction in indicated
Sodium Trifluoroacetate: an Efficient Difluorocarbene Precursor for Alkenes
作者:Ying Chang、Chun Cai
DOI:10.1246/cl.2005.1440
日期:2005.10
A novel and efficient difluorocarbene precursor was achieved. In a convenient procedure, a variety of alkenes could be gem-difluorocyclopropanated with sodium trifluoroacetate to give the corresponding products in moderate to high yields, using azobisisobutyronitrile (AIBN) as the catalyst.