使用Fenton试剂在二甲亚砜中研究了BrCF 2 CO 2 Et对芳族化合物的直接乙氧基羰基二氟甲基化反应。在室温下,通过二茂铁和H 2 O 2的组合,催化获得具有乙氧基羰基二氟甲基的各种五元杂芳族化合物,苯衍生物和尿嘧啶。乙氧基羰基二氟甲基化发生在芳香族化合物亲电取代趋势预测的位置。当使用对位取代的苯胺衍生物作为底物时,通过在乙氧基羰基二氟甲基化反应中一锅合成3,3-二氟-2,3-二氢吲哚-2-酮衍生物。氨基的邻位和氨基与相邻的乙氧基羰基二氟甲基的连续分子内酰胺化。
Direct ethoxycarbonyldifluoromethylation of aromatic compounds using Fenton reagent
作者:Yuhki Ohtsuka、Tetsu Yamakawa
DOI:10.1016/j.tet.2011.01.049
日期:2011.3
Direct ethoxycarbonyldifluoromethylation of aromaticcompounds by BrCF2CO2Et was investigated using Fenton reagent in dimethylsulfoxide. Various five-membered hetero-aromatic compounds, benzene derivatives and uracil having ethoxycarbonyldifluoromethyl group were obtained catalytically with the combination of ferrocene and H2O2 at room temperature. The ethoxycarbonyldifluoromethylation occurred at
使用Fenton试剂在二甲亚砜中研究了BrCF 2 CO 2 Et对芳族化合物的直接乙氧基羰基二氟甲基化反应。在室温下,通过二茂铁和H 2 O 2的组合,催化获得具有乙氧基羰基二氟甲基的各种五元杂芳族化合物,苯衍生物和尿嘧啶。乙氧基羰基二氟甲基化发生在芳香族化合物亲电取代趋势预测的位置。当使用对位取代的苯胺衍生物作为底物时,通过在乙氧基羰基二氟甲基化反应中一锅合成3,3-二氟-2,3-二氢吲哚-2-酮衍生物。氨基的邻位和氨基与相邻的乙氧基羰基二氟甲基的连续分子内酰胺化。
Visible Light-Promoted Phosphine-Catalyzed Difluoroalkylation of Arenes and Heterocycles
作者:Heng Lu、Dong-yu Wang、Ao Zhang
DOI:10.1021/acs.joc.9b02882
日期:2020.1.17
A visible light-promoted difluoroalkylation reaction of arenes or heterocycles, using triaryl phosphine as the catalyst and difluoroalkyl iodide as the alkylating agent, is presented. The strategy is highlighted by photocatalyst-free, mild reaction conditions and a broad substrate scope. Mechanistic experiments indicate that this reaction involves a radical-chain process that is initiated by an electron
The first AgI-mediated C–H ethoxycarbonyl difluoromethylation with TMSCF2COOEt (TMS = trimethylsilyl) has been developed. The radical difluoromethylation proceeds smoothly to give the difluoromethylated arenes in moderate to high yields with Friedel–Crafts-type regioselectivity. Mechanistic studies indicate that the innate C–H difluoromethylation proceeds through an electrophilic radical-type pathway
申请人:Industry-University Cooperation Foundation Hanyang University ERICA Campus 한양대학교 에리카산학협력단(120120008551) Corp. No ▼ 131471-0017977BRN ▼134-82-10205
公开号:KR20160040874A
公开(公告)日:2016-04-15
본 발명은 온화한 조건에서 방향족 화합물에 효율적으로 다이플루오로알킬기를 도입할 수 있는 다이플루오로알킬기가 도입된 방향족 화합물의 제조 방법에 관한 것이다. 일 구현예에 따르면, 상기 제조 방법은 이리듐계 광촉매, 방향족 화합물, 할로다이플루오로아세테이트, 베이스 및 용매를 포함하는 혼합물에 가시광선을 조사하는 것을 포함한다.
Fluoroalkylation of aromatic compounds with per(poly)fluoroalkyl chlorides initiated by sodium dithionite in DMSO
作者:Xiao-Ting Huang、Zheng-Yu Long、Qing-Yun Chen
DOI:10.1016/s0022-1139(01)00442-0
日期:2001.10
Treatment of electron-rich aromatic and heteroaromatic. compounds with per(poly)fluoroalkyl chlorides in the presence of sodium dithionite in DMSO gives the corresponding fluoroalkylated products in moderate to good yields. The structures and yields of products depend mainly on the position and electron-donating ability of the substituents on the aromatic compounds. (C) 2001 Elsevier Science B.V. All rights reserved.