Highly Enantioselective Rh-Catalyzed Hydrogenation of β,γ-Unsaturated Phosphonates with Chiral Ferrocene-Based Monophosphoramidite Ligands
摘要:
An enantioselective synthesis of chiral alkylphosphonates bearing a beta-stereogenic center, based on the Rh-catalyzed asymmetric hydrogenation of corresponding beta-substituted beta,gamma-unsaturated phosphonates with a Ferrocene-based monophosphoramidite ligand Under the mild hydrogenation conditions, was developed, in which an ee value of up to 98% was obtained.
Intramolecular Syn and Anti Hydrosilylation and Silicon-Assisted Cross-Coupling: Highly Regio- and Stereoselective Synthesis of Trisubstituted Allylic Alcohols
作者:Scott E. Denmark、Weitao Pan
DOI:10.1021/ol0342002
日期:2003.4.1
prepared by intramolecular hydrosilylation of an unsymmetrical disiloxane by the use of Pt (syn) and Ru (anti) catalysts. This new class organosiliconreagents underwent cross-coupling reactions with a range of aryl iodides to afford (E)- and (Z)-trisubstituted allylicalcohols in a highly stereospecific fashion.
Disclosed is a phase change ink composition comprising (1) an ink carrier comprising (A) a first component which comprises an ester-amide material, and (B) a second component which comprises either (i) a material selected from the group consisting of urethane compounds, urea compounds, urethane-urea compounds, and mixtures thereof, (ii) a polyalkylene wax, or (iii) a mixture thereof; and (2) a colorant.
Pd-catalyzed Heck arylation of allyl alcohols in tetraalkylammoniumionic liquids (ILs) can be made highly selective toward the formation of either aromatic carbonyl compounds or aromatic conjugated alcohols by carefully choosing both the IL and the base.
DUBOUDIN J. G.; JOUSSEAUME B., J. ORGANOMETAL. CHEM., 1979, 168, NO 1, 1-11