difluoromethylation of heteroaromatic compounds using off-the-shelf difluoroacetic acid as the difluoromethylating reagent has been developed. Mono-difluoromethylation versus bis-difluoromethylation is controlled as the result of the reaction temperature. The reactions described here enable access to the late-stage C−H mono- and bis-difluoromethylation for preparation of tool compounds for chemical biology and
2-Difluoromethylpyridine as a bioisosteric replacement of pyridine-<i>N</i>-oxide: the case of quorum sensing inhibitors
作者:Truong Thanh Tung、Thang Nguyen Quoc
DOI:10.1039/d1md00245g
日期:——
Herein, we demonstrate that 2-difluoromethylpyridine is a bioisosteric replacement of pyridine-N-oxide. Using the quorum sensing inhibitor 4NPO as a model compound, a library of 2-difluoromethylpyridine derivatives was designed, synthesized, and evaluated toward quorum sensing activity, biofilm formation, anti-violacein activity, and protease activity. As a result, compounds 1 (IC50 of 35 ± 1.12 μM)
作者:M. A. Lytkina、E. V. Eliseenkov、V. P. Boyarskii、A. A. Petrov
DOI:10.1134/s1070428017040066
日期:2017.4
Free radical difluoromethylation of protonated heteroaromatic bases was accomplished using sodium difluoromethanesulfinate in combination with tert-butyl hydroperoxide in a two-phase system (methylene chloride-water) at room temperature. The difluoromethylation products of methyl pyridine-4-carboxylate, pyridine-4-carbonitrile, and 2-amino-1,3,4-thiadiazole were isolated on a preparative scale.
[Ph
<sub>4</sub>
P]
<sup>+</sup>
[Cu(CF
<sub>2</sub>
H)
<sub>2</sub>
]
<sup>−</sup>
: A Powerful Difluoromethylating Reagent Inspired by Mechanistic Investigation
作者:Haiwei Zhao、Xuebing B. Leng、Wei Zhang、Qilong Shen
DOI:10.1002/anie.202210151
日期:2022.10.17
A powerful difluoromethylating reagent [Ph4P]+[Cu(CF2H)2]− that was able to difluoromethylate a variety of aryl and alkyl electrophiles was developed. In the presence of an oxidant, complex 2 also reacted with various lithium nbutyl arylboronic acid pinacol esters, alkyne and heteroarene. Moreover, complex 2 could transmetalate the difluoromethyl reagent to other metals such as [Ph4P]+[Cu(Cl2)]− and