METHOD OF DEUTERATING BENZYL-POSITION IN -O-BENZYL GROUP
申请人:Sajiki Hironao
公开号:US20090036659A1
公开(公告)日:2009-02-05
To provide a method for efficiently and industrially deuterating the benzyl position of a —O-benzyl group formed by introducing a benzyl group, a benzyloxymethyl group and the like as a protecting group.
The deuteration method for the benzyl position of a —O-benzyl group of a compound having the —O-benzyl group which may have a substituent, comprising reacting the compound with a heavy hydrogen source in the coexistence of a palladium/carbon-ethylenediamine complex and hydrogen.
Efficient and Convenient Heterogeneous Palladium-Catalyzed Regioselective Deuteration at the Benzylic Position
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