A Conjugate Reduction Pathway to Chiral Silanes Using CuH
作者:Bruce Lipshutz、Ching-Tien Lee、Benjamin Taft
DOI:10.1055/s-2007-983830
日期:2007.10
Experimental details concerning asymmetric 1,4-reduction of β -silylated -β,β -disubstituted enoates catalyzed by CuH are described. High yields and enantiomeric excesses are to be expected when Solvias’ JOSIPHOS bis-phosphine PPF-P( T-Bu) 2 is used as a nonracemic ligand.
We have successfully developed the asymmetric hydrogenation of β‐silyl‐α,β‐unsaturatedesters to prepare chiral 3‐substituted‐3‐silylpropionic esterproducts catalyzed by rhodium/bisphosphine‐thiourea (ZhaoPhos) with excellent results (up to 97% yield, >99% ee, 1500 TON). Moreover, our hydrogenation products can be efficiently converted to other important organic molecules, such as chiral ethyl (R