New efficient methods for the synthesis and in-situ preparation of ruthenium(II) complexes of atropisomeric diphosphines and their application in asymmetric catalytic hydrogenations
作者:Bernd Heiser、Emil A. Broger、Yvo Crameri
DOI:10.1016/s0957-4166(00)82157-6
日期:1991.1
A new synthetically useful method for the synthesis of the diphosphine ruthenium dicarboxylato complexes (P-P)Ru(O2CR)2 (R = CF3 and CH3) is presented, which uses the easily accessible complex (COD)2Ru2(mu-O2CCF3)4 as starting material. This complex as well as (COD)Ru(eta-2-O2CCH3)2 and (COD)2Ru2Cl4(NCCH3) have been shown to be suitable precursor complexes for the in-situ preparation of ruthenium(II) dicarboxylato and dichloro complexes of atropisomeric diphosphines, respectively. The high efficacy of the preformed and in-situ generated ruthenium complexes as precatalysts is demonstrated in asymmetric hydrogenations of allylic alcohols, enamides, and a beta-keto ester.
Enantio- and Diastereoselective Hydrogenation of Farnesol and O-Protected Derivatives: Stereocontrol by Changing the CC Bond Configuration
作者:Aie Wang、Bettina Wüstenberg、Andreas Pfaltz
DOI:10.1002/anie.200705521
日期:2008.3.7
SCHMID, RUDOLF;ANTOULAS, SYMEON;RUTTIMANN, AUGUST;SCHMID, MAX;VECCHI, MAX+, HELV. CHIM. ACTA., 73,(1990) N, C. 1276-1299