hydrogen-deuterium (H-D) exchange reaction on the benzylic site proceeded in D2O in the presence of a small amount of H2 gas. The use of the Pd/C-ethylenediamine complex [Pd/C(en)] as a catalyst instead of Pd/C led to the efficient deuterium incorporation into the benzylic site of O-benzyl protective groups without hydrogenolysis. These H-D exchange reactions provide a post synthetic and D(2)-gas-free deuterium-labeling
Nickel and Nucleophilic Cobalt-Catalyzed Trideuteriomethylation of Aryl Halides Using Trideuteriomethyl <i>p</i>-Toluenesulfonate
作者:Kimihiro Komeyama、Yuta Yamahata、Itaru Osaka
DOI:10.1021/acs.orglett.8b01863
日期:2018.7.20
Herein, a novel approach for the trideuteriomethylation of aryl halides using nickel and nucleophilic cobalt catalysts and the readily available trideuteriomethyl p-toluenesulfonate (CD3OTs) is described. This method provides access to a wide range of CD3-containing arenes. Moreover, a transmethylation step is revealed as crucial in the nickel/cobalt catalytic mechanism.
Site-Specific and Degree-Controlled Alkyl Deuteration via Cu-Catalyzed Redox-Neutral Deacylation
作者:Xukai Zhou、Tingting Yu、Guangbin Dong
DOI:10.1021/jacs.2c04382
日期:2022.6.8
Deuteratedorganiccompounds have become increasingly important in many areas; however, it remains challenging to install deuterium site-selectively to unactivated aliphatic positions with control of the degree of deuteration. Here, we report a Cu-catalyzed degree-controlled deacylative deuteration of diverse alkyl groups with the methylketone (acetyl) moiety as a traceless activating group. The use
Synthesis of <i>Methyl</i>-d<sub>3</sub> Arene via Electrochemical Deuterodefluorination of Trifluoromethyl Arene
作者:Jiaming Cheng、Jie Sheng、Xu Cheng
DOI:10.1021/acs.orglett.3c01942
日期:2023.8.4
The methyl-d3 group is a new isotopic functional group for medicine design. In this work, we report an electrochemical deuteration approach for converting aromatic trifluoromethyl to methyl-d3 groups with deuterium water in common DMF. Yields up to 94%, D ratio up to 97%, and CD3 incorporation up to 90% were achieved. A basic additive is the key factor enabling the highly chemoselective reaction.