Highly Diastereoselective and Enantioselective Synthesis of α-Hydroxy β-Amino Acid Derivatives: Lewis Base Catalyzed Hydrosilylation of α-Acetoxy β-Enamino Esters
By design: A series of α‐acetoxy‐β‐enamino esters 1 were synthesized and then subjected to catalytic asymmetric hydrosilylation. In the presence of a chiral Lewisbase catalyst, the reactions proceeded smoothly to provide a wide range of chiral α‐acetoxy β‐amino acid derivatives in high yields with good diastereoselectivities and enantioselectivities.
A Strategy to Synthesize Taxol Side Chain and (−)-<i>epi</i> Cytoxazone via Chiral Brønsted Acid-Rh<sub>2</sub>(OAc)<sub>4</sub> Co-catalyzed Enantioselective Three-Component Reactions
作者:Yu Qian、Xinfang Xu、Liqin Jiang、Dipak Prajapati、Wenhao Hu
DOI:10.1021/jo101559p
日期:2010.11.5
A new approach to synthesize optically active β-amino-α-hydroxyl acid derivatives via chiral Brønsted acid-Rh2(OAc)4 cocatalyzed three-component reactions of diazo acetates with alcohols and imines is reported. A matched reaction system was identified to give the products in moderate diastereoselectivity and good enantioselectivity. Application of this methodology is demonstrated in the efficient synthesis