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。
An efficient and general method for the synthesis of difluoroalkylated uracils, pyridinones, and coumarins through visible-light-induced reaction with commercial materials is developed. The strategy proceeds with high efficiency under mild reaction conditions and shows excellent functional group compatibility, even toward bromide and hydroxyl group, thus demonstrates high potent application in a late-stage fluoroalkylation. Moreover, the difluoroalkylated products can be further transformed to a diverse variety of difluoroalkylated heterocycles, including molecules of potential biological activity.
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。