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
Rhodium‐Catalyzed Stereoselective Deuteration of Benzylic C–H Bonds via Reversible η
<sup>6</sup>
‐Coordination
作者:Qi‐Kai Kang、Yuntong Li、Kai Chen、Hui Zhu、Wen‐Qiang Wu、Yunzhi Lin、Hang Shi
DOI:10.1002/anie.202117381
日期:2022.3.7
A novel rhodium-catalyzed H/D exchange of primary, secondary, and tertiary benzylic C−H bonds by means of an η6-coordination strategy is reported. The method, which features high regioselectivity and stereoretention, shows broad functional group tolerance and has been used in late-stage labeling of pharmaceuticals.
报道了通过 η 6配位策略实现伯、仲和叔苄基 C-H 键的新型铑催化 H/D 交换。该方法具有高区域选择性和立体保留性,具有广泛的官能团耐受性,已用于药物的后期标记。
Pd/C-H2-Catalysed Deuterium Exchange Reaction of the Benzylic Site in D2O
Pd/C is found to catalyse efficient and chemoselective exchange of deuterium derived from D2O with hydrogens on a benzylic carbon in the presence of a catalytic amount of hydrogen at room temperature.