Highly enantioselective synthesis of β-hydroxy nitriles by the cyanomethylation of aldehydes using DPMPM as a chiral catalysts or ligand
作者:Kenso Soai、Yuji Hirose、Shuichi Sakata
DOI:10.1016/s0957-4166(00)80498-x
日期:1992.6
Optically active beta-hydroxy nitriles in up to 93% e.e. were obtained by the enantioselective addition of cyanomethylzinc bromide to aldehydes using DPMPM as a chiral catalyst or ligand.
Transfer Hydrogenation in Water: Enantioselective, Catalytic Reduction of α-Cyano and α-Nitro Substituted Acetophenones
作者:Omid Soltani、Martin A. Ariger、Henar Vázquez-Villa、Erick M. Carreira
DOI:10.1021/ol1008894
日期:2010.7.2
Catalytic reduction of α-substituted acetophenones under conditions involving asymmetric transfer hydrogenation in water is described. The reaction is conducted in water and open to air, and formic acid is used as reductant.
A direct catalyticasymmetricaddition of acetonitrile to aldehydes that realizes over 90 % ee is the ultimate challenge in alkylnitrile addition chemistry. Herein, we report achieving high enantioselectivity by the strategic use of a sterically demanding NiII pincer carbene complex, which afforded highly enantioenriched β‐hydroxynitriles. This highly atom‐economical process paves the way for exploiting